1510. iM2500. 1535 TRVL. AL2216-0803. Peli model numbers can look like a secret language, and every week someone asks us to translate: does the number mean the size? Is a 1600 bigger than a 1510? What is the "iM" in front of some of them?
This guide is the full decoder, updated for the 2026/27 season. It includes the honest part most articles skip: some Peli numbers genuinely encode dimensions, and some do not. Once you know which is which, the whole catalogue becomes much easier to read. Seven answers, one quick-reference list, a table that matches models to jobs and an FAQ, so you can read a model number at a glance before you buy.
Cracking the Code: 7 Answers
1. The honest truth first: Protector and Air numbers are names, not formulas
Let us start by clearing up the most common myth. The four-digit numbers on Protector and Air cases (1200, 1510, 1535, 1615) are not a mathematical code for dimensions. There is no hidden centimetre formula. They are model designations that grew with the catalogue over several decades. That is why guessing sizes from arithmetic fails: the number is an address in the family tree, not a measurement.
The good news is that the tree itself is very readable, as the next answer shows. And when you do need a real measurement, the product page lists it. For example, the Peli 1510 Protector Carry-On Case measures 56.1 × 35.9 × 22.9 cm outside and 50.2 × 27.9 × 19.3 cm inside, while the Peli Air 1535 TRVL measures 55.8 × 35.5 × 22.8 cm outside. Two cases with different numbers and almost the same footprint: exactly the point of this first answer.
2. The ranges do map to size families
While no formula exists, the numbering follows a practical logic you can use. In the Protector line, the low 11xx numbers are the small cases (1150, 1170), the 12xx to 13xx band covers compact everyday sizes (1200, 1300), the 14xx to 15xx band is the medium and carry-on heartland (1400, 1450, 1500, 1510), and 16xx to 17xx means large equipment and long cases (1670 and its neighbours). The Air line lives mostly in the 14xx to 16xx band, mirroring the travel-sized sweet spot.
Rule of thumb: within a line, a higher first pair of digits generally means a bigger case. Just do not expect the growth to be linear, and treat the rule as a starting point for your search rather than a specification. If you want to see the extremes of the range, our guides to the smallest Peli cases and the largest Peli cases show both ends side by side.
3. "iM" means injection-moulded: the Storm signature
Every Storm case wears an iM prefix: iM2050, iM2100, iM2300, iM2950. It stands for injection-moulded, a nod to the line's manufacturing method and its Hardigg heritage. The digits after the prefix follow the same practical logic as answer 2: iM20xx are the compact cases, iM21xx to iM23xx the small-to-medium band, and iM29xx and up the large wheeled transport formats.
When you see "iM" on a spec sheet, think Storm family, Press and Pull latches and HPX resin. If you are curious how HPX stacks up against ABS, polypropylene and polycarbonate, our hard-shell materials guide breaks the whole alphabet down. The product page of the Peli Storm iM2950 Expedition Case, for instance, describes an HPX resin shell, four Press and Pull latches, a telescoping handle and in-line wheels, which is the typical profile of the large iM29xx band.
4. The numbers that are a size code: Peli-Hardigg
Here is where it gets satisfying. The roto-moulded Peli-Hardigg transport cases, with prefixes like AL, use part numbers that literally spell out the dimensions in inches. The first four digits are length and width, and the digits after the dash split the height into base and lid. So an AL2216-0803 is a 22 × 16 inch container with an 8 inch base and a 3 inch lid. Suffix letters add configuration, for example a wheeled build or fork-lift provisions.
If you work with Hardigg containers, you can size them from the part number alone, with no catalogue needed. It is the same family of containers we cover in our guide to transport crates for museum exhibits and evacuation.
5. Footprint siblings: the same job across different lines
The most useful pattern for buyers is that several sizes exist as near-equivalents across the families, built for the same job with different construction. The classic example is the carry-on club. The Protector 1510 and the Air 1535 share the maximum-cabin-size mission, so choosing between them is a question of line philosophy (weight, mass, latches and interior), not size.
The Peli Air 1535 product page describes a body up to 40% lighter than comparable hard cases thanks to the HPX² polymer, and the TRVL edition is listed at 4.7 kg. The Protector 1510 uses a high-impact structural copolymer with an open-cell core. Whichever sibling you pick, verify your airline's current limits before flying: our guide to cabin luggage dimensions and the 5 traps shops will not mention explains why the centimetres matter. The same sibling logic repeats at other sizes: match the mission first, then pick the family.
6. Suffixes and long SKUs: the configuration layer
One more layer sits on top of the model number: configuration. A suffix like TRVL marks a travel edition, the same family of shell with a luggage-style interior (lid organiser and packing cubes) instead of foam, as on the 1535 TRVL. The long SKU strings you see on labels (for example 1510-000-110 or IM2050-31001) encode the factory configuration, with interior option and colour among the elements.
The practical translation in our shop is simple. Most models come as with foam, no foam, with padded dividers or with TrekPak, in your choice of colour. That is the suffix layer, made human-readable. The foam option uses Pick N Pluck foam: you pull out pre-scored cubes by hand to shape cavities around your gear.
7. How to use all this when buying
Three habits make the numbers work for you. Search by the number, because it is the universal ID: a review of the same model number elsewhere applies directly to the case in our shop, and accessories listed for a model number fit that model everywhere. Never buy on the number alone: always check the interior dimensions on the product page against your gear, because a bigger number is a tendency, not a promise. And match spares by model: O-rings, latches, wheels and foam sets are listed per model number, which is exactly why the number is moulded into the shell.
If you are comparing materials as well as sizes, read the materials guide next. If the case is mainly a carry-on, our article on how to choose the strongest carry-on suitcase goes deeper on wheels, handles and shell construction.
The 30-Second Decoder
- Four digits, no prefix (1510, 1535): Protector or Air. A name, not a formula; a higher band generally means a bigger case.
- iM + four digits: Storm line, injection-moulded, Hardigg-born.
- AL-style with a dash (AL2216-0803): Peli-Hardigg, where the digits are the inches.
- TRVL and similar words: configuration suffixes, the same family of shell with a different interior.
- Long SKU strings: factory configuration codes covering colour and interior.
- Golden rule: the number finds the case; the interior dimensions confirm it.
Which Model for What: Eight Numbers Decoded
These are the most-asked-about numbers in the catalogue, matched to the job they usually do. Dimensions are given only where the product page lists them; for the rest, please check the product page before you order.
| Model | Line and band | Best for | Key facts from the product page |
|---|---|---|---|
| Peli 1150 Protector Case | Protector, low 11xx band | Radios, batteries, first-aid kits, small instruments | ABS copolymer shell, O-ring seal, automatic pressure valve; colours black, yellow, orange, silver; dimensions: see product page |
| Peli 1500 Protector Case | Protector, 15xx medium band | A camera body with two lenses, drone kits, field instruments | Foam, no foam or padded dividers; six colours; made in Germany; dimensions: see product page |
| Peli 1510 Protector Carry-On Case | Protector, carry-on heartland | Cabin baggage for cameras, laptops and instruments | 56.1 × 35.9 × 22.9 cm outside, 50.2 × 27.9 × 19.3 cm inside; wheels and trolley handle; colours black, yellow, orange, desert tan, pink |
| Peli Air 1485 Carry-On Case | Air, compact carry-on | Under-seat or overhead-bin carry of fragile kit | HPX² polymer, IP67, no wheels, fold-down handle; no foam or Pick N Pluck foam; dimensions: see product page |
| Peli Air 1535 Carry-On Case | Air, carry-on | Photographers and field crews who refuse to check kit | Up to 40% lighter than comparable hard cases; four interior options; six colours; dimensions: see product page |
| Peli Air 1535 TRVL Carry-On Luggage | Air, TRVL travel suffix | Business travel and everyday cabin luggage | 55.8 × 35.5 × 22.8 cm, 4.7 kg, two TSA-approved combination locks, spinner wheels, black |
| Peli Air 1615 Checked Baggage | Air, 16xx large travel band | Checked baggage with camera rigs, drones or instruments | HPX² polymer, IP67 and MIL-SPEC, five colours including French Blue; dimensions: see product page |
| Peli Storm iM2950 Expedition Case | Storm, iM29xx large transport band | Expeditions, off-road transport, large wheeled loads | HPX resin shell, four Press and Pull latches, telescoping handle, in-line wheels; black or OD green; dimensions: see product page |
Reading the Range in Practice
Want to see the number bands with your own eyes? Take one case from each band: a low-band compact Protector (1150), the medium heartland (1500 and 1510), a large Air traveller (1615) and a big iM-prefixed Storm (iM2950). Four numbers, four sizes, one legible system. The thumbnails and prices on the product pages make the size difference obvious, and the specification lists give you the numbers behind it.
For a closer look at the most famous number of all, read our full guide to why the Peli 1510 became the industry-standard carry-on. And if you are curious where these cases come from and how to read the origin marks on them, where Peli cases are made covers the factories and the history.
Frequently Asked Questions
Is a higher Peli model number always a bigger case?
Within one line, a higher first pair of digits generally means a bigger case, but it is a tendency and not a rule. Across lines the numbers are not comparable: a 1535 Air and a 1510 Protector have almost the same footprint. Always confirm with the interior dimensions on the product page.
What does the "iM" in Peli Storm cases stand for?
It stands for injection-moulded. All Storm cases carry the prefix, for example iM2050, iM2100, iM2300 and iM2950, and the digits after it follow the same small-to-large logic as the other lines.
Do any Peli numbers encode real dimensions?
Yes: the Peli-Hardigg transport cases with AL-style part numbers. The digits give length and width in inches, and the figures after the dash give the base and lid heights. AL2216-0803, for instance, is a 22 × 16 inch container with an 8 inch base and a 3 inch lid.
What does TRVL mean on a model name?
TRVL marks a travel edition: the same family of shell fitted with a luggage-style interior, such as a lid organiser and packing cubes, instead of foam. The Peli Air 1535 TRVL in our shop also has two integrated TSA-approved combination locks.
Number Found. Now What?
Next time a spec sheet, a rental house or a colleague throws a Peli number at you, you can place it in seconds: line, size band, configuration. When the number you need is not obvious, because your gear and not the catalogue should drive the choice, send us your equipment list. Matching real kit to the right number is the part we genuinely enjoy. For the season ahead, our cabin luggage guide is the best companion read before you book your next flight.
