# Pet Carriers & Crates

Pick the shell first: soft-sided for a quick trip or an airline seat, rigid plastic or welded wire for anything that must hold its shape in a car. "Airline approved" and "crash-tested" are different claims, one about size and ventilation, the other about surviving an impact, and several crash-tested products have failed independent testing.

## How it works

A carrier or crate is a portable, pet-sized box with a carry handle: rigid plastic, welded or collapsible wire, or fabric on a frame, with a latched door and enough ventilation to keep air moving. A fixed structure like an outdoor hutch or kennel run, or an open-top pen with no handle, is a different product. Soft-sided bags are light and fold flat to fit under an airline seat, but offer little crash protection. Rigid, one-piece ("rotomolded") plastic and welded wire hold their shape under load and are what pass crash tests, but are heavy and rarely fold. Two rulebooks govern it: airlines set their own cabin rule, and for cargo IATA sets a separate container rule on size, ventilation and construction, while car safety is tested voluntarily by groups like the Center for Pet Safety. A product can meet one standard and say nothing about the other. [7] [2] [4] [5]

| Family | What it is | Suits |
|---|---|---|
| Soft-sided | Fabric stretched over a collapsible frame, usually with mesh panels; folds flat and is the type almost every airline recommends for the cabin. | Small cats and small dogs, air travel in the cabin, and quick trips where weight matters more than impact protection. |
| Hard-sided plastic | A rigid shell, either one-piece ("rotomolded") or two halves that snap or bolt together; the classic "flight kennel" shape. | Checked or cargo air travel, larger dogs, and anyone who wants a shell that holds up in a crash rather than just in a fall. |
| Wire or collapsible metal | Welded or hinged metal bars, often foldable flat for storage, usually with a removable tray. | Home crate training and car travel for dogs too big for most soft or hard carriers; not used for air travel. |

## How an expert narrows the choice

```mermaid
timeline
  section 1 · Shell type
    hard_sided_plastic : ask Plastic shell build
    soft_sided / wire_collapsible : skip Plastic shell build
  section 2 · Where it's going
    flying : ask Ventilation, IATA cargo-crate compliant : skip Vehicle anchor system
    driving : ask Crash-test credential, Vehicle anchor system, Plastic shell build : skip IATA cargo-crate compliant
    home_or_vet : ask Folds flat : skip IATA cargo-crate compliant
```

1. **Shell type.** Soft-sided bag, hard plastic crate, or wire crate?
   Shell material decides what the product can and can't be used for: ventilation count, whether it folds, and whether it can pass a crash test all follow from this one choice.
   If hard_sided_plastic: ask Plastic shell build.
   If soft_sided or wire_collapsible: skip Plastic shell build.

2. **Where it's going.** Mostly flying, driving, or home and vet visits?
   Flying, driving and home-only use are governed by different standards (airline/IATA size and ventilation rules versus car-crash testing versus neither), so this answer decides which facets even apply.
   If flying: ask Ventilation, IATA cargo-crate compliant; skip Vehicle anchor system.
   If driving: ask Crash-test credential, Vehicle anchor system, Plastic shell build; skip IATA cargo-crate compliant.
   If home_or_vet: ask Folds flat; skip IATA cargo-crate compliant.

## What to surface

### Shell type

Whether the enclosure is a fabric bag on a frame, a rigid plastic crate, or welded or collapsible wire. This one choice decides ventilation, whether it folds for storage, and whether it can hold up in a car crash. Soft-sided bags fold flat and fit under an airline seat but give little impact protection. Rigid plastic and wire hold their shape under load, which is why every crate that has passed an independent crash test is one of those two, never a fabric bag. [7] [4] [5]

Values: soft_sided, hard_sided_plastic, wire_collapsible.
Question to ask: Soft-sided bag, hard plastic crate, or wire crate?

Used as: top-level split, filter. Data: on the listing, backfill cost none. Look for it as: Usually in the title or the first bullet ("soft-sided", "hard-sided", "wire", "flight kennel", "collapsible crate").
Always visible from the product photo and title; never needs backfill.

### Where it's going

Whether the carrier or crate is mainly for flying, for driving, or for home use and vet visits. Flying is governed by airline and IATA size and ventilation rules; driving is where independent crash testing applies; home and short vet trips involve neither regime. Answering this first rules out asking about crash credentials for a carrier that will only ever sit in a closet, or about cargo-crate compliance for one that only ever rides in the back seat. [4] [5] [2]

Values: flying, driving, home_or_vet.
Question to ask: Mostly flying, driving, or home and vet visits?

Used as: top-level split. Data: derived from listing fields, backfill cost none. Look for it as: Not a field. Infer from the listing's own framing ("airline approved", "car crash tested", "crate training") when stated; otherwise ask directly.

### Maximum pet weight

The heaviest pet the carrier or crate is rated to hold. It's the first hard cutoff: a carrier rated for an 8 lb cat will not hold a 20 lb dog regardless of what else it offers. Already covered by the shared pets-standard schema (`sizing.max_pet_weight`); listed here only so it shows up alongside the carrier-specific facets.

Question to ask: How much does your pet weigh?

Used as: filter. Data: on the listing, backfill cost low. Look for it as: Usually in the title or a size/weight-capacity bullet ("up to 15 lbs").
Chart: horizontal scale with the pet's weight marked against the rated maximum.

### Folds flat

Whether the crate or carrier folds flat or disassembles for storage when not in use. Wire crates and some soft carriers fold flat, which matters if it only comes out for training or occasional trips. In practice, the rigid one-piece shells that pass crash tests are not built to fold either, an observation about the products on the market rather than a claim any cited source states, so there's a real storage-versus-crash-protection trade here. [7]

Question to ask: Need it to fold flat for storage?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Usually stated directly ("folds flat", "collapsible") in the title or bullets.

### Crash-test credential

Whether the product carries an independent crash-safety certification, only claims testing without one, or makes no safety claim at all. The Center for Pet Safety found that several carriers and crates marketed with testing or crash-protection claims failed on their first independent test, while a small number of named products (Gunner Kennel, several PawsInCar and Lucky Duck products among them) carry the CPS Certified mark after passing. A brand's own "crash-tested" claim and an independent pass are not the same thing. [1] [2] [3]

Values: cps_certified, brand_claims_untested, no_claim.
Question to ask: Passed an independent crash test?

Used as: filter, shown on the card. Data: needs research, backfill cost low. Look for it as: Rarely a field; sometimes a logo or "CPS Certified" text on the brand's own page, never on a retail listing in this check.
Check the product name and brand against CPS's own certified-products list (centerforpetsafety.org/cps-certified), which names fewer than two dozen products; everything else is brand_claims_untested or no_claim.
Chart: three-value badge: certified, claims-only, no claim.

### Vehicle anchor system

Whether the carrier or crate ships with straps or a connector meant to tie it to the car, rather than just a shell that sits on a seat. In the Center for Pet Safety's tests, the box itself often survived while the strap or latch connecting it to the car failed; a Sleepypod and a Pet Ego carrier both failed their first crash test for this reason and only passed after the connection hardware was changed. A crate with no anchor system at all is not restrained in a crash no matter how strong its shell is. [3] [2]

Question to ask: Need tie-down straps for the car?

Used as: filter, shown on the card. Data: on the listing, backfill cost low. Look for it as: Usually a bullet ("includes tie-down straps", "anchor kit included") or absent entirely.

### Plastic shell build

For hard-sided plastic crates only: whether the shell is molded in one piece, snapped or bolted together from panels, or built on a wood or composite panel core. This is where crash performance actually diverged in the Center for Pet Safety's tests: a one-piece molded crate held together with no structural damage, while a crate with wood-chipboard side and rear panels had those panels destroyed and its door lock fail on the same impact. The shell material matters more than the brand. [2]

Values: rotomolded_one_piece, multi_panel_snap_together, wood_or_composite_paneled.

Used as: shown on the card, filter. Data: needs research, backfill cost medium. Look for it as: Sometimes stated as "rotomolded" or "one-piece" on the brand's own page; rarely on a retail listing.
Only answerable from brand spec pages or teardown-style reviews; limit backfill to hard-sided, driving-context products rather than the whole catalog. This value scheme rests on a single crash-test source so far; look for a second source (a teardown review or a second testing body) before trusting it as more than a working hypothesis.

### Ventilation

How many sides of the enclosure have mesh or vent openings, rather than solid material. Delta requires soft-sided kennels to vent on 3 sides for domestic flights and 4 for international, and American requires nylon mesh on 3 or more sides; a crate that only vents on one or two sides may not clear check-in even if it fits the size limit. [4] [5]

Values: two_sides, three_sides, four_sides_or_full_mesh.

Used as: shown on the card, filter. Data: on the listing, backfill cost medium. Look for it as: Usually visible in product photos and sometimes stated as "mesh on 3 sides" in bullets; not a structured field on most listings.
The medium cost is extraction effort, not scarcity: the information is usually present on the listing (in a photo or a bullet) but has to be read off it rather than pulled from a field. Limit backfill to products already flagged for the flying context.

### IATA cargo-crate compliant

Whether a hard-sided crate is built to IATA's container rules for shipping a pet as checked or manifest cargo, a separate standard from an airline's own cabin-carrier rule. International cargo shipment runs on IATA's rules, not the airline's cabin-size recommendation, and the two get conflated under one "airline approved" label. A crate built for the cabin is not automatically built for cargo, and vice versa. [6] [8]


Used as: filter, shown on the card. Data: needs research, backfill cost medium. Look for it as: Sometimes stated on brand pages for crates marketed as "IATA compliant" or "airline approved for shipping"; rarely on retail listings.
Only worth backfilling for hard-sided crates in the flying context, and only where international cargo is plausible. IATA's full container specification is sold, not published, and no source here gives a checkable figure or criterion behind this boolean: the store page only confirms a container-requirements section exists, and a brand's own "IATA compliant" or "airline approved" claim is marketing, not a cross-checkable standard. Treat every value of this facet as an unverified brand claim until a source with an actual criterion is found.

## What you give up

- The crates that pass independent crash testing are rigid, one-piece shells with reinforced anchor points; they run $150 to $300 and weigh enough that carrying one any distance is a chore. A $40 soft-sided or wood-paneled crate is light and cheap because it isn't built to take an impact. Board branch: "Show me crash-tested options".
- The soft-sided bags airlines recommend near 18 x 11 x 11 in are sized to fit under a seat, not to let a pet stand and turn around comfortably; a crate roomy enough for that is usually too big for the cabin. Board branch: "Show me roomier options".
- A soft-sided carrier vented on four sides satisfies Delta's international cabin rule, but soft-sided carriers are not accepted for international cargo shipment at all; cargo needs a hard-sided crate built to IATA's separate container standard. Board branch: "Show me cargo-compliant crates".

## How to draw it

**Use-by-shell compliance grid** (two axis map, shows Shell type, Where it's going). A simple grid of shell type against where it's going, shaded to show which combinations are realistic (soft-sided for flying cabin, hard-sided or wire for driving or cargo) and which are a mismatch (soft-sided for international cargo, for instance). This is a proposal, nobody draws it this way yet.

## Words you will meet

- **Flight kennel**. An older, still-common name for a rigid plastic crate, from when it was the main type allowed on planes.
- **CPS Certified**. A mark from the independent nonprofit Center for Pet Safety, given only to products that passed its own crash tests.
- **Rotomolded**. Molded as one continuous piece of plastic rather than snapped or bolted together from separate panels, which is why it tends to survive an impact better.
- **IATA**. The International Air Transport Association, the airline trade body whose Live Animals Regulations set container rules for pets shipped as cargo internationally.

## Where we made a call

- No single cabin-carrier size works on every airline; soft-sided near 18 x 11 x 11 in fits most, but each sets its own limit. (confidence high). Delta and American independently state the same 18 x 11 x 11 in figure for soft-sided kennels, but both also say the true ceiling depends on the aircraft, and American gives smaller, different numbers for hard-sided carriers by aircraft type. [4] [5]
- A brand's 'crash-tested' claim does not guarantee a pass; CPS found several claimed-tested products failed on the first independent test. (confidence high). Center for Pet Safety's own 2015 studies document specific failures (Proline Milan's panels and lock, Sleepypod's and Pet Ego's connection hardware) on products marketed as tested, with passes only after changes. [2] [3]
- A crate should let a dog stand up and turn around; this is a single-source rule of thumb, not a measured standard. (confidence medium). Only the Humane Society states this plainly among the sources I could reach; AKC's, Chewy's, Rover's and PetMD's crate-size guides, which likely restate or quantify it further, all blocked or returned no article text. [7]
- IATA periodically revises container and ventilation standards for pet crates, but the full text is sold, not freely published. (confidence low). IATA's own store page names container and ventilation requirements as sections of its Live Animals Regulations and a 2027 edition update, but I could not read the actual figures behind either. [6]

## References

1. [CPS Certified](https://centerforpetsafety.org/cps-certified/) (specialist review). Supports: Independent voluntary crash-safety certification exists; names currently certified carriers and crates.
2. [2015 Crate Study Results](https://centerforpetsafety.org/2015-crate-study-results/) (specialist review). Supports: Gunner Kennel passed with no structural failure at 75 lb test dog; Proline Milan's wood panels and lock failed; Variocage crushed 10 in but door held.
3. [2015 Carrier Study Results](https://centerforpetsafety.org/2015-carrier-study-results/) (specialist review). Supports: Sleepypod and Pet Ego carriers failed first crash test on connection hardware; passed only after hardware changes.
4. [Pet Travel Overview](https://www.delta.com/us/en/pet-travel/overview) (other). Supports: Soft-sided kennel max 18x11x11 in recommended; ventilation 3 sides domestic, 4 sides international.
5. [Traveling with pets](https://www.aa.com/i18n/travel-info/special-assistance/pets.jsp) (other). Supports: Soft-sided max 18x11x11 in all flights; hard-sided max varies by aircraft type; mesh ventilation on 3+ sides.
6. [Live Animals Regulations (store page)](https://www.iata.org/en/publications/store/live-animals-regulations/) (standards body). Supports: Container, ventilation and stocking-density requirements exist as sections of the full manual.
7. [Crate Training 101](https://www.humanesociety.org/resources/crate-training-101) (primer). Supports: Three crate families: plastic flight kennel, fabric on a frame, collapsible metal; crate should let a dog stand and turn around.
8. [Dog Kennels & Dog Crates (collection page)](https://www.petmate.com/collections/dog-kennels) (retail listing). Supports: Example of a brand's own unverified airline-approved claim, not a checkable IATA criterion.