Osprey Sirrus 24 vs. Osprey Aether 55
Two carry-on travel backpacks, compared spec for spec.
Feature by feature
| Osprey Sirrus 24 | Feature | Osprey Aether 55 |
|---|---|---|
| Storage | ||
| 4 | Compression | >5 |
| None | Expanded Capacity | None |
| 0 | Opening | 0 |
| top | Passport | top |
| N | Passthrough | N |
| Carry | ||
| Y | Backpack | Y |
| Y | Hip Belt | Y |
| Y | Sternum Strap | Y |
| Inside | ||
| N | Laptop | N |
| 3 | Main Compartments | 4 |
| N | Organizer | N |
| Outside | ||
| × | Hard Shell | × |
| Y | Rain-fly | Y |
| 2, side | Water Bottle Holder | 2, side |
| N | Water Resistant | Y |
| Material | |
| bluesign® APPROVED 210D recycled honey comb nylon, PFC/PFAS-free DWR | bluesign® APPROVED 420HD nylon packcloth, PFC-free DWR |
Key differences between the Osprey Sirrus 24 and Osprey Aether 55
- Compression straps: 4 on the Osprey Sirrus 24; >5 on the Osprey Aether 55.
- Main compartments: 3 on the Osprey Sirrus 24; 4 on the Osprey Aether 55.
- Water resistant: No on the Osprey Sirrus 24; Yes on the Osprey Aether 55.
Both have: passport pocket, backpack straps, hip belt, sternum strap, rain cover, water bottle pockets.
Which airlines take each bag as a carry-on
We checked both bags against the carry-on size limits of 189 airlines. 1 accept both. 72 accept only the Osprey Sirrus 24, and 0 accept only the Osprey Aether 55.
Only the Osprey Sirrus 24 fits
Adria Airways, Aegean Airlines, Aer Lingus, Aeroflot, Aerolineas Argentinas, Aeromexico, Air Astana, Air Caraibes, Air Europa, Air France, Air India, Air Koryo, Air Mauritius, Air New Zealand, Air Nostrum, Air Tahiti Nui, All Nipon Airways, ANA, Atlas Global, Azul Linhas, Boliviana de Aviacion, British Airways, Caribbean Airlines, China Southern, Conviasa, Copa Airlines, Cubana de Aviacion, Czech Airlines, EL AL, Finnair, Frontier Airlines, Gol Linhas Aereas, Hainan Airlines, Iberia, Indigo, Interjet, Iran Air, Iran Aseman Air, Island Air, Japan Airlines, Jet Airways, Jet2, Kenya Airways, KLM, Korean Air, Kuwait Air, LATAM , Middle East Airlines, Monarch Airlines, Onur Air, Peach, PenAir, Philippine Airlines, Royal Air Morocco, Saudi Arabian Airlines, Sichuan Airlines, SilkAir, Silver Airways, Singapore Airlines, Sky Airlines, Southwest Airlines, SpiceJet, Spirit Airlines, Sun Country, TAAG Angola, TAM Airlines, Thai Airways, Travel Service Airlines, Ural Airlines, Uzbekistan Air, Virgin America, WOW Airlines.
Osprey Sirrus 24 vs. Osprey Aether 55: which should you pack?
The Osprey Aether 55 carries 31L more than the Osprey Sirrus 24 (24L vs. 55L), while the Osprey Sirrus 24 is the lighter pack at 1.2kg (vs. 2.2kg). For carry-on flexibility, the Osprey Sirrus 24 fits 39% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Osprey Aether 55; if you want to travel lighter, the Osprey Sirrus 24 is the better call.