# Bags, Wraps & Covers This leaf covers three unrelated jobs: sealing food in a bag or a roll, keeping weather and pests off furniture and equipment, and carrying loads in a reusable tote. Each job has its own barrier material and its own trade-off, so the first question is simply which job it is. ## How it works Every product here is a thin barrier between the contents and the outside: a plastic film, foil, treated fabric or silicone wall that keeps air, moisture, light or pests on one side. For food bags and wraps, the material (polyethylene, PVC, PVDC, foil, parchment) sets how well it blocks air and whether it tolerates heat for reheating or sous vide; thinner, cheaper films trade barrier strength for flexibility and cost. For furniture and equipment covers, the fabric sets whether rain is kept out completely (vinyl or PVC-backed) at the cost of trapping condensation underneath, or let through a little in exchange for breathing (woven polyester, canvas). For carry bags, the weave and seams decide how many loaded trips the bag survives, which is why reusable-bag standards test a bag against a fixed load rather than trusting how thick it looks. [1] [2] [4] [3] | Family | What it is | Suits | |---|---|---| | Food storage & wrap | Bags and rolls that seal food in: zip-top, vacuum-seal and fold-top bags, plastic wrap, foil, parchment and wax paper. | kitchens, pantries, freezers | | Furniture & equipment cover | Fitted or draped covers that keep dust, weather or pests off furniture, appliances, grills and mattresses. | patios, garages, storage, bedrooms | | Carry bag | Reusable totes and produce bags bought to replace single-use checkout bags. | grocery runs, errands | ## How an expert narrows the choice ```mermaid timeline section 1 · What it's for food storage or wrap : ask Bag or roll, Reusable, Closure, Bag grade, Heat rating, Wrap material : skip Indoor or outdoor, Cover fabric, Fit dimensions, Full encasement furniture or equipment cover : ask Indoor or outdoor, Cover fabric, Fit dimensions, Full encasement : skip Bag or roll, Reusable, Closure, Bag grade, Heat rating, Wrap material carry or shopping bag : ask Reusable, Load capacity : skip Bag or roll, Closure, Bag grade, Heat rating, Wrap material, Indoor or outdoor, Cover fabric, Fit dimensions, Full encasement section 2 · Bag or roll a bag you seal : ask Closure, Bag grade : skip Wrap material a roll you tear off : ask Wrap material, Reusable : skip Closure, Bag grade section 3 · Reusable Disposable bag or wrap, or reusable? section 4 · Indoor or outdoor Indoor dust cover, or outdoor weather cover? ``` 1. **What it's for.** Food storage, a furniture cover, or a carry bag? The three families share almost nothing downstream: a food bag's facets are about air and heat, a cover's are about weather, a carry bag's are about load. Nothing else is worth asking first. If food storage or wrap: ask Bag or roll, Reusable, Closure, Bag grade, Heat rating, Wrap material; skip Indoor or outdoor, Cover fabric, Fit dimensions, Full encasement. If furniture or equipment cover: ask Indoor or outdoor, Cover fabric, Fit dimensions, Full encasement; skip Bag or roll, Reusable, Closure, Bag grade, Heat rating, Wrap material. If carry or shopping bag: ask Reusable, Load capacity; skip Bag or roll, Closure, Bag grade, Heat rating, Wrap material, Indoor or outdoor, Cover fabric, Fit dimensions, Full encasement. Skip if already known: an earlier answer naming a food, a piece of furniture or equipment, or 'grocery bag', a query that already says freezer, patio cover, mattress, or tote. 2. **Bag or roll.** A bag you seal, or a roll you tear off? This decides whether closure type and freezer grade matter at all, versus whether the wrap material is the whole decision. A roll is never resealed; a bag always is. If a bag you seal: ask Closure, Bag grade; skip Wrap material. If a roll you tear off: ask Wrap material, Reusable; skip Closure, Bag grade. 3. **Reusable.** Disposable bag or wrap, or reusable? Independent of the other splits: a reusable silicone bag, a disposable snack bag, and a reusable tote can each answer this differently without changing anything else about them. 4. **Indoor or outdoor.** Indoor dust cover, or outdoor weather cover? Outdoor covers live or die on whether rain gets in or condensation gets trapped underneath. Indoor dust covers face neither problem, so the weatherproofing question only matters outside. ## What to surface ### What it's for Whether the product seals food, protects furniture or equipment, or is a reusable shopping or produce bag. This is the only question that applies to the whole leaf; everything else is specific to one of the three jobs. A buyer who says 'freezer' never needs to hear about denier fabric, and a buyer who says 'patio chairs' never needs to hear about sous vide. Values: food storage or wrap, furniture or equipment cover, carry or shopping bag. Question to ask: Food storage, a furniture cover, or a carry bag? Used as: top-level split, filter. Data: on the listing, backfill cost none. Look for it as: Always in the title: 'freezer bags', 'patio furniture cover', 'reusable grocery bags'. ### Indoor or outdoor Whether the cover will sit indoors away from weather, or outside exposed to rain, sun and temperature swings. Outdoor covers need a fabric that handles rain and UV without trapping condensation; indoor dust covers only need to keep dust and light off, so a cheap nonwoven cover is enough and a waterproof one is wasted money and can even trap moisture. Values: indoors, outdoors. Question to ask: Indoor dust cover, or outdoor weather cover? Used as: top-level split, filter. Data: on the listing, backfill cost none. Look for it as: Title words: 'patio', 'outdoor', 'all-weather' versus 'dust cover', 'indoor'. ### Bag or roll Whether the product is a bag you open and close repeatedly, or a roll or sheet you tear off and use once. A bag's whole value is in how it closes and how much air it keeps out over repeated use. A roll's value is in the sheet material itself, since it is used once and discarded; closure type and freezer grade are meaningless for a roll. Values: a bag you seal, a roll you tear off. Question to ask: A bag you seal, or a roll you tear off? Used as: top-level split, filter. Data: on the listing, backfill cost none. Look for it as: The product title: 'bags' versus 'wrap', 'foil' or 'paper'. ### Reusable Whether the item is meant to be washed and used again, as opposed to thrown away after one use. Reusable silicone, fabric and heavy-plastic items change the buyer's math from a per-box price to a cost spread over many washes, and only reusable items need to survive a dishwasher or washing machine. Regulators have started testing reusable bags against a fixed load rather than accepting that they merely look thicker. [3] Question to ask: Disposable bag or wrap, or reusable? Used as: top-level split, filter. Data: on the listing, backfill cost none. Look for it as: Title or first bullet: 'reusable', 'silicone', or a pack count implying disposables. ### Bag grade The weight class a zip-top or fold-top bag is sold as: freezer, everyday storage, or snack/sandwich. Brands sell the same basic bag in grades that trade thickness for price: freezer bags are the thickest and best at blocking air and moisture, which is what actually prevents freezer burn, while snack and sandwich bags are thin and meant for a few hours on a counter, not weeks in a freezer. [2] [9] [5] Values: freezer, everyday storage, snack or sandwich. Question to ask: Freezer, everyday storage, or snack size? Used as: filter, shown on the card. Data: on the listing, backfill cost none. Look for it as: Always in the title: 'freezer bags', 'storage bags', 'snack bags', 'sandwich bags'. ### Wrap material The sheet material on a roll: plastic cling wrap, aluminum foil, parchment paper, wax paper, or reusable beeswax-coated cloth. PVC and PVDC cling wraps block the most moisture and oxygen, which is why delis still favour them, but the public has raised concerns about plasticizers transferring into food from PVC; the FDA's 2002 review found proper use poses no danger. Foil blocks light and air but can't microwave; parchment is heat-safe but not a seal; wax paper is neither; reusable beeswax wrap is washable but less airtight. [1] [8] Values: plastic cling wrap, aluminum foil, parchment paper, wax paper, reusable beeswax or cloth wrap. Question to ask: Cling wrap, foil, parchment, wax paper, or beeswax? Used as: filter, shown on the card. Data: on the listing, backfill cost none. Look for it as: Its own product title; these are sold as separate products, not a shared field, including 'beeswax wrap'. ### Full encasement Whether the cover zips shut on all sides to fully enclose the item, as opposed to draping over the top like a throw. Only a fully zipped encasement traps bugs that are already inside until they die; a cover that only drapes over the top does nothing for an infestation underneath. Even a full encasement will not stop new bugs from crawling onto the outside and biting, which buyers expecting total prevention are often disappointed by. [7] Question to ask: Fully zipped encasement, or just a drape-over cover? Used as: filter, shown on the card. Data: on the listing, backfill cost none. Look for it as: The word 'encasement' versus 'cover' or 'protector' in the title. ### Fit dimensions The length, width and height (or diameter) the cover is cut to fit. A cover cut too loose flaps in wind and lets rain wick in at the seams; one cut too tight won't fit over cushions or armrests. Experts always check the stated dimensions against the actual piece rather than trusting a category label like 'sofa cover'. Question to ask: What are the length, width, and height? Used as: filter. Data: on the listing, backfill cost none. Look for it as: The size chart in the title or a variant selector, same as every other fitted household cover. ### Closure How the bag opens and closes: a zip track, a slider, a vacuum machine seal, or a simple fold or twist tie. A zip-top or slider reseals in a second by hand but always traps some air, so food inside is more exposed to freezer burn than a bag that was vacuum-sealed, which pulls air out with a machine but is awkward to reopen and reuse. Fold-or-twist closures (bread bags) are cheapest and leak the most air. [2] [9] Values: zip-top, slider or press-seal, vacuum-seal, fold or twist-tie. Question to ask: Zip-top, slider, vacuum-seal, or fold-and-tie? Used as: filter, shown on the card. Data: on the listing, backfill cost none. Look for it as: Title or first bullet: 'zip', 'slider', 'vacuum sealer bags', or implied by a bread/produce bag listing. Chart: Air-exclusion scale. ### Heat rating Whether the bag or wrap is only rated for storage, or is also rated safe for the microwave, or for both microwave reheating and sous vide cooking in hot water. Using a bag or film that is not rated for heat risks it melting, warping, or leaching plasticizers into hot food faster than normal; this is the fact behind the add-on schema's existing sous_vide_safe field, which this facet generalises to cover microwave use as well. [1] Values: storage only, microwave-safe, microwave and sous vide safe. Question to ask: Storage only, microwave-safe, or sous-vide safe too? Used as: filter, shown on the card. Data: needs research, backfill cost low. Look for it as: A back-of-box icon or a bullet claim; often missing from the retail title and bullets, which is why this is researched rather than on-listing. Infer from material where missing: silicone and polypropylene bags are usually microwave- and sous-vide-rated; thin PE storage/snack bags usually are not; foil is never microwave-safe. ### Cover fabric What the cover is made of: a breathable woven fabric, a vinyl or PVC-coated waterproof fabric, canvas, or a light nonwoven dust-cover material. A fully waterproof vinyl or PVC-backed cover keeps rain off completely but also traps the condensation that forms underneath as temperatures swing, which is the leading cause of mould and mildew on covered outdoor furniture. A woven, breathable fabric lets that moisture escape at the cost of letting a little rain through in a downpour; canvas sits in between and needs occasional reproofing. [4] [6] Values: woven breathable polyester, vinyl or PVC-coated, canvas, nonwoven dust cover. Used as: filter, shown on the card. Data: on the listing, backfill cost medium. Look for it as: Named in the title or first bullet ('600D Oxford', 'vinyl', 'canvas'); sometimes only in a material dropdown. When missing, infer from the weight claim and price tier: budget outdoor covers skew vinyl, mid-range skew woven polyester. Unverified for this sub-family: every furniture/patio-cover retailer and brand page fetched this session (Home Depot, Lowe's, The Spruce, BHG, Budge, Duck Covers) was blocked (403/404), so 'usually on the listing' is carried over from other household-cover facets, not confirmed against an actual cover listing. Chart: Breathability vs waterproofing map. ### Load capacity The weight the bag is rated to carry without the seams or handles failing. Most carry-bag listings only say 'heavy duty' with no number behind it. The benchmark experts and testing labs actually use is a fixed load, commonly cited at 10 kg (22 lb), carried repeatedly rather than just held still, because a seam that holds a static weight can still fail on the walk home. [3] Used as: shown on the card, sortable. Data: needs research, backfill cost high. Look for it as: Occasionally a bullet point claim ('holds up to X lb'); rarely a structured field. Look for a stated weight limit on the brand's own page; where absent, do not infer a number, leave unknown rather than guessing from bag thickness. Every brand (Ziploc, FoodSaver, Stasher) and regulatory page (CalRecycle, ecfr.gov, fda.gov, fsis.usda.gov) that would carry this number was blocked this session, so backfill is realistically limited to the few brand pages that happen to be fetchable. Chart: position on a horizontal scale with the 10 kg lab-test benchmark marked. ## Numbers worth computing | Metric | Formula | Why | |---|---|---| | Cost per square foot (USD per sq ft) | `price / (roll_length_ft * roll_width_ft)` | Roll length and width vary a lot between box sizes, so the per-box price hides which roll is actually cheaper per square foot of food it can cover; this is the number a bulk buyer compares, not the sticker price. | | Cover fit slack (in) | `cover_fit_dimensions_stated - furniture_dimensions` | A buyer measures their own furniture (furniture_dimensions is that buyer-supplied measurement, not a listing field) and subtracts it from the cover's stated size; too much slack flaps and lets rain wick in, too little won't fit over cushions. | ## What you give up - PVC cling wrap has low permeability to water vapor and oxygen, which is why delis still favour it over thinner polyethylene film, but plasticizers can migrate from PVC into food and the public has raised concerns about it. The FDA's 2002 review found that plastic wrap used properly poses no danger to health. [1] Board branch: "See more polyethylene wraps". - A zip-top or slider bag reseals in a second by hand but always traps some air, exposing food to freezer burn sooner than a vacuum-sealed bag, which needs a machine and is awkward to reopen and reuse. [2] [9] Board branch: "See more vacuum-seal bags". - A fully waterproof vinyl or PVC-backed cover keeps rain off completely but also traps the condensation that forms underneath as temperatures swing, which is the leading cause of mould and mildew on covered outdoor furniture. A breathable woven fabric lets that moisture escape at the cost of letting a little rain through in a downpour. [4] Board branch: "See more breathable furniture covers". - A reusable bag or cover costs more upfront and needs washing between uses, but spreads that cost over many trips; regulators are starting to require it pass a load test, not just look thicker, before it counts as reusable. [3] Board branch: "See more reusable bags". ## How to draw it **Air-exclusion scale** (scale, shows Closure). Lets a buyer see at a glance which closure keeps the most air out, from a loose fold-or-twist tie at one end to a vacuum-sealed bag at the other. This is a proposal, nobody draws it this way yet. **Breathability vs waterproofing map** (two axis map, shows Cover fabric, Indoor or outdoor). Plots cover fabrics from breathable to waterproof against indoor to outdoor use, showing why a vinyl tarp suits a boat but a knit cover suits a patio chair in a humid yard. This is a proposal, nobody draws it this way yet. ## Words you will meet - **Mil**. A unit of plastic film thickness equal to one thousandth of an inch, about 0.0254 mm. - **Denier**. A measure of fabric yarn weight, defined as grams per 9,000 metres of yarn; higher numbers mean a heavier, tougher weave. - **Freezer burn**. The dried, leathery patches that form on frozen food when air reaches its surface and its moisture sublimates away. - **Vacuum seal**. Pulling the air out of a bag before sealing it, which slows freezer burn and spoilage by removing the oxygen that drives both. - **Sous vide**. Cooking food sealed in a bag inside a temperature-controlled water bath, which requires a bag rated to tolerate that heat. - **Encasement**. A cover that fully zips shut on every side to enclose an item, as opposed to one that only drapes over the top. - **PVDC**. Polyvinylidene chloride, a plastic film layer used in some cling wraps and high-barrier vacuum bags because it blocks oxygen unusually well. ## Where we made a call - A fully zipped encasement traps bed bugs already inside until they die, but will not stop new bugs climbing on. (confidence high). University of Kentucky's entomology fact sheet states this limit directly. We found no formal certifying standard for 'bed bug proof'; this is extension guidance, not a regulatory test. [7] - Public concern about plasticizers migrating from PVC into food was addressed, not raised, by the FDA's 2002 review, which found proper use safe. (confidence high). DEHA and dioxin fears were public, not FDA-raised; the FDA's 2002 Consumer Magazine review concluded proper use poses no danger. Verified by direct fetch of the Wikipedia Plastic wrap article, correcting an earlier backwards reading of this citation. [1] - Removing air slows freezer burn, but a vacuum seal is not a substitute for refrigeration. (confidence high). Two independently fetched sources agree air removal slows sublimation; an oxygen-free bag can still let anaerobic bacteria grow if left unrefrigerated. [2] [9] - A waterproof vinyl cover traps more condensation and mould risk than a breathable woven cover. (confidence medium). Reasoned by analogy from tarp material science; we found no furniture-cover-specific test. Treat as a reasoned inference, not a measured fact. [4] - Reusable-bag rules are shifting from a thickness threshold toward testing against an actual carried load. (confidence medium). California's 2024 law closed a thickness-based loophole; a lab load-test protocol is cited but we did not independently fetch its text. [3] ## References 1. [Plastic wrap](https://en.wikipedia.org/wiki/Plastic_wrap) (primer). Supports: PVC/PVDC vs polyethylene cling-film trade-off; FDA raised microwave plasticizer-migration concern in 2002. 2. [Vacuum packing](https://en.wikipedia.org/wiki/Vacuum_packing) (primer). Supports: vacuum packing reduces freezer burn by removing air; anaerobic bacteria risk in oxygen-depleted food. 3. [Reusable shopping bag](https://en.wikipedia.org/wiki/Reusable_shopping_bag) (primer). Supports: 10 kg (22 lb) lab load-test protocol for reusable bags; 2024 California law closed a thickness-based reusable loophole. 4. [Tarpaulin](https://en.wikipedia.org/wiki/Tarpaulin) (primer). Supports: woven, vinyl and canvas cover material trade-offs; canvas is water-resistant, not fully waterproof, and can mildew. 5. [Thousandth of an inch](https://en.wikipedia.org/wiki/Thousandth_of_an_inch) (primer). Supports: mil unit definition: 0.001 in, 0.0254 mm. 6. [Units of textile measurement](https://en.wikipedia.org/wiki/Denier_(unit)) (primer). Supports: denier defined as grams per 9,000 metres of yarn. 7. [Bed Bugs (ENTFACT-636)](https://entomology.ca.uky.edu/ef636) (academic). Supports: full zippered encasement traps existing bed bugs until they die; encasement does not stop new bed bugs climbing on. 8. [Beeswax wrap](https://en.wikipedia.org/wiki/Beeswax_wrap) (primer). Supports: beeswax wrap is reusable and washable, unlike cling wrap, foil, parchment or wax paper. 9. [Freezer Burn: What It Is, Food Safety, and Tips for Prevention](https://www.healthline.com/nutrition/freezer-burn) (primer). Supports: freezer burn is moisture loss from air exposure via sublimation; removing air and wrapping tightly prevents it.