--- url: "https://onebag.travel/compare/n8ttb1wbeu/cotopaxi-allpa-travel-pack-42l/rzsc61ufe5/aer-pro-slim-pack/" title: "Cotopaxi Allpa Travel Pack 42L vs Aer Pro Slim Pack" description: "Cotopaxi Allpa Travel Pack 42L vs Aer Pro Slim Pack: capacity, weight, dimensions and how many airlines accept each as a carry-on, side by side." source: "https://onebag.travel/compare/n8ttb1wbeu/cotopaxi-allpa-travel-pack-42l/rzsc61ufe5/aer-pro-slim-pack/" --- 1. [Home](https://onebag.travel/) 2. [Carry-On Travel Backpacks](https://onebag.travel/carryons/) 3. Cotopaxi Allpa Travel Pack 42L vs. Aer Pro Slim Pack # Cotopaxi Allpa Travel Pack 42L vs. Aer Pro Slim Pack Two carry-on travel backpacks, compared spec for spec. ## [Cotopaxi Allpa Travel Pack 42L](https://onebag.travel/carryon/n8ttb1wbeu/cotopaxi-allpa-travel-pack-42l/) by [Cotopaxi](https://onebag.travel/carryons/?brands=Cotopaxi) ![Front facing view of the Cotopaxi Allpa Travel Pack 42L](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1621552508/carryons/Cotopaxi_Allpa_Travel_Pack_42L_e0l0ab.webp)
Capacity42 L
Weight1.4 kg
Dimensions56×36×27 cm
Airline fit2%
Price$250
## Feature by feature | Cotopaxi Allpa Travel Pack 42L | Feature | Aer Pro Slim Pack | | --- | --- | --- | | Storage | | N | Compression | N | | None | Expanded Capacity | None | | 1 | Opening | 1 | | front | Passport | front | | Y | Passthrough | Y | | Carry | | hideable | Backpack | Y | | hideable | Hip Belt | N | | Y | Sternum Strap | Y | | Inside | | 15in | Laptop | 16in | | 3 | Main Compartments | 3 | | Y | Organizer | Y | | Outside | | × | Hard Shell | × | | N | Rain-fly | N | | 1, side | Water Bottle Holder | 1, side | | Y | Water Resistant | Y |
Material
100% recycled 840D TPU-coated nylon840D CORDURA re/cor recycled nylon
## [Aer Pro Slim Pack](https://onebag.travel/carryon/rzsc61ufe5/aer-pro-slim-pack/) by [Aer](https://onebag.travel/carryons/?brands=Aer) ![Front facing view of the Aer Pro Slim Pack](https://res.cloudinary.com/obt/image/upload/c_fill,w_400/v1788990323/carryons/aer-pro-slim-pack-rzsc61ufe5.webp)
Capacity13 L
Weight0.9 kg
Dimensions43×31×10 cm
Airline fit95%
Price$140
## Key differences between the Cotopaxi Allpa Travel Pack 42L and Aer Pro Slim Pack - **Backpack straps:** Hideable on the Cotopaxi Allpa Travel Pack 42L; Yes on the Aer Pro Slim Pack. - **Hip belt:** Hideable on the Cotopaxi Allpa Travel Pack 42L; No on the Aer Pro Slim Pack. - **Laptop sleeve:** 15in on the Cotopaxi Allpa Travel Pack 42L; 16in on the Aer Pro Slim Pack. Both have: passport pocket, luggage passthrough, sternum strap, built-in organizer, water bottle pockets, water resistant. ## Which airlines take each bag as a carry-on We checked both bags against the carry-on size limits of 189 airlines. 4 accept both. 0 accept only the Cotopaxi Allpa Travel Pack 42L, and 175 accept only the Aer Pro Slim Pack. ### Only the Aer Pro Slim Pack fits Adria Airways, Aegean Airlines, Aer Lingus, Aeroflot, Aerolineas Argentinas, Aeromexico, Air Asia, Air Astana, Air Baltic, Air Canada, Air Caraibes, Air China, Air Europa, Air France, Air India, Air Koryo, Air Macau, Air Malta, Air Mauritius, Air New Zealand, Air Nostrum, Air Serbia, Air Seychelles, Air Tahiti, Air Tahiti Nui, Air Wisconsin, AirAsiaX, Alaska Airlines, All Nipon Airways, Allegiant Air, American Airlines, American Eagle, ANA, Asiana Airlines, ATA Airlines, Atlas Global, Austrian, Avianca , Azerbaijan Airlines, Azul Linhas, Bahamasair, Bangkok Airways, Belavia, Biman Bangladesh, Blue Air, Boliviana de Aviacion, British Airways, Brussels Airlines, Bulgaria Air, Cambodia Angkor Air, Caribbean Airlines, Cathay Pacific, Cayman Airways, Cebu Pacific, China Airlines, China Eastern, China Southern, CommutAir, Conviasa, Copa Airlines, Croatia Air, Cubana de Aviacion, Czech Airlines, Delta Airlines, Dragonair, easyJet, EL AL, Emirates Airlines, Enter Air, Ethiopian Airlines, Etihad Airways, Eurowings, EVA Air, Fiji Airways, Finnair, Flair Air, flybe, Frontier Airlines, Garuda Indonesia, Gol Linhas Aereas, Gulf Air, Hainan Airlines, Hawaiian Airlines, Hong Kong Airlines, Iberia, Icelandair, Indigo, InselAir, Interjet, Iran Air, Iran Aseman Air, Japan Airlines, Jet Airways, Jet2, jetBlue Airways, Jetstar Airways, Jetstar Asia, Juneyao Airlines, Kenya Airways, KLM, Korean Air, Kulula, Kuwait Air, LATAM , Liat Airlines, LOT Polish, Lufthansa, Luxair, Mahan Air, Malaysia Airlines, Mango, Meridiana Fly, Mesa Airlines, Middle East Airlines, Monarch Airlines, Nordwind Airlines, Norwegian, Oman Air, Onur Air, Pakistan International, Peach, PenAir, Philippine Airlines, Porter Airlines, Qantas Airways, Qatar Airways, Ravn Alaska, Regional Express, Republic Airways, Royal Air Morocco, Royal Brunei Airlines, Royal Jordanian, Ryanair, S7, SAS Scandinavian, Saudi Arabian Airlines, Scoot, Shandong Airlines, Shenzhen Airlines, Sichuan Airlines, SilkAir, Silver Airways, Singapore Airlines, Sky Airlines, Skywest, Inc., South African Airways, Southwest Airlines, SpiceJet, Spirit Airlines, SriLankan Airlines, Sun Express, Swiss Int'l Air Lines, TAAG Angola, TAM Airlines, TAP Air Portugal, TAROM, Thai Airways, Tianjin Airlines (A320 & E190), Tiger Airways, Trans States, Travel Service Airlines, TUI, Turkish Airlines, Ukraine International, United Airlines, Ural Airlines, Uzbekistan Air, Vietnam Airlines, VIM Airlines (Closed), Virgin Atlantic, Virgin Australia, Volotea, WestJet, WOW Airlines, Xiamen. ## Cotopaxi Allpa Travel Pack 42L vs. Aer Pro Slim Pack: which should you pack? The **Cotopaxi Allpa Travel Pack 42L** carries 29L more than the **Aer Pro Slim Pack** (42L vs. 13L), while the **Aer Pro Slim Pack** is the lighter pack at 0.9kg (vs. 1.4kg). For carry-on flexibility, the **Aer Pro Slim Pack** fits 95% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Cotopaxi Allpa Travel Pack 42L; if you want to travel lighter, the Aer Pro Slim Pack is the better call.