Mammut Nirvana 28 vs. Osprey Sirrus 24
Two carry-on travel backpacks, compared spec for spec.
Mammut Nirvana 28
| Capacity | 28 L |
| Weight | 1.1 kg |
| Dimensions | 50×30×19 cm |
| Airline fit | 92% |
| Price | $220 |
Feature by feature
| Mammut Nirvana 28 | Feature | Osprey Sirrus 24 |
|---|---|---|
| Storage | ||
| 6 | Compression | 4 |
| None | Expanded Capacity | None |
| 1 | Opening | 0 |
| front | Passport | top |
| N | Passthrough | N |
| Carry | ||
| Y | Backpack | Y |
| Y | Hip Belt | Y |
| Y | Sternum Strap | Y |
| Inside | ||
| N | Laptop | N |
| 3 | Main Compartments | 3 |
| N | Organizer | N |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | Y |
| 2, side | Water Bottle Holder | 2, side |
| N | Water Resistant | N |
| Material | |
| 90% Polyamide, 10% Polyester | bluesign® APPROVED 210D recycled honey comb nylon, PFC/PFAS-free DWR |
Key differences between the Mammut Nirvana 28 and Osprey Sirrus 24
- Compression straps: 6 on the Mammut Nirvana 28; 4 on the Osprey Sirrus 24.
- Opening: Clamshell on the Mammut Nirvana 28; Other on the Osprey Sirrus 24.
- Passport pocket: Front on the Mammut Nirvana 28; Top on the Osprey Sirrus 24.
- Rain cover: No on the Mammut Nirvana 28; Yes on the Osprey Sirrus 24.
Both have: backpack straps, hip belt, sternum strap, 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. 73 accept both. 100 accept only the Mammut Nirvana 28, and 0 accept only the Osprey Sirrus 24.
Only the Mammut Nirvana 28 fits
Air Asia, Air Baltic, Air Canada, Air China, Air Macau, Air Malta, Air Niugini, Air Serbia, Air Seychelles, Air Wisconsin, AirAsiaX, Alaska Airlines, Allegiant Air, American Airlines, Asiana Airlines, ATA Airlines, Austrian, Avianca , Azerbaijan Airlines, Bahamasair, Bangkok Airways, Belavia, Biman Bangladesh, Blue Air, Brussels Airlines, Bulgaria Air, Cambodia Angkor Air, Cathay Pacific, Cayman Airways, Cebu Pacific, China Airlines, China Eastern, CommutAir, Croatia Air, Delta Airlines, Dragonair, Emirates Airlines, Enter Air, Ethiopian Airlines, Etihad Airways, Eurowings, EVA Air, Fiji Airways, Flair Air, flybe, Garuda Indonesia, Hawaiian Airlines, Hong Kong Airlines, Icelandair, InselAir, jetBlue Airways, Jetstar Airways, Jetstar Asia, Juneyao Airlines, Kulula, Liat Airlines, LOT Polish, Lufthansa, Luxair, Mahan Air, Malaysia Airlines, Mango, Meridiana Fly, Mesa Airlines, Nordwind Airlines, Norwegian, Oman Air, Pakistan International, Porter Airlines, Qantas Airways, Qatar Airways, Republic Airways, Royal Brunei Airlines, Royal Jordanian, Ryanair, S7, SAS Scandinavian, Scoot, Shandong Airlines, Shenzhen Airlines, Skywest, Inc., South African Airways, SriLankan Airlines, Sun Express, Swiss Int'l Air Lines, TAP Air Portugal, TAROM, Tianjin Airlines (A320 & E190), Tiger Airways, Trans States, TUI, Turkish Airlines, Ukraine International, United Airlines, Vietnam Airlines, VIM Airlines (Closed), Virgin Atlantic, Volotea, WestJet, Xiamen.
Mammut Nirvana 28 vs. Osprey Sirrus 24: which should you pack?
The Mammut Nirvana 28 carries 4L more than the Osprey Sirrus 24 (28L vs. 24L), while the Mammut Nirvana 28 is the lighter pack at 1.1kg (vs. 1.2kg). For carry-on flexibility, the Mammut Nirvana 28 fits 92% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Mammut Nirvana 28; if you want to travel lighter, the Mammut Nirvana 28 is the better call.