Ortlieb Commuter-Daypack 27L vs Rab Ascendor 27L Mountain Pack
The Ortlieb Commuter-Daypack 27L is 27L and 0.8kg1.8lb; the Rab Ascendor 27L Mountain Pack is 27L and 0.73kg1.6lb. The Rab Ascendor 27L Mountain Pack is 0.07kg0.2lb lighter. The Rab Ascendor 27L Mountain Pack costs $60 less. The Ortlieb Commuter-Daypack 27L fits the carry-on limit of 32 of 36 major airlines and the Rab Ascendor 27L Mountain Pack fits 1; under the seat, 0 and 0 of 26.
| Spec | Ortlieb Commuter-Daypack 27L | Rab Ascendor 27L Mountain Pack |
|---|---|---|
| Price | $210 | $150Best |
| Volume | 27L | 27L |
| Weight | 0.8kg1.8lb | 0.73kg1.6lbBest |
| Carry-on compliance | 89%Best | 3% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 50×32×21cm19.5×12.5×8.5in | 54×27×28cm21.5×10.5×11in |
| Laptop | sleeve, size not published | n/a |
| Bottle pockets | 0 | n/a |
| Opening | Roll-top | Panel access, U-shaped zipped opening, the pack can hang by its lid on a belay |
| Warranty | 5 years | Lifetime |
| Organizer | No | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | Yes |
| Frame sheet | No | Removable |
| Water-resistant | Yes | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | Yes | Removable |
| Sternum strap | Yes | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | PU-coated nylon (PS33) | 210D Robic Ripstop Nylon with Trishield Dura Coating, 200D polyester / Hydroshield lining |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Ortlieb Commuter-Daypack 27L | Rab Ascendor 27L Mountain Pack |
|---|---|---|---|
| Air Canada | Carry-on | Fits | Too big |
| Air France | Carry-on | Fits | Too big |
| AirAsia | Carry-on | Fits | Too big |
| Alaska Airlines | Carry-on | Fits | Too big |
| Allegiant Air | Carry-on | Fits | Too big |
| American Airlines | Carry-on | Fits | Too big |
| ANA (All Nippon Airways) | Carry-on | Fits | Too big |
| Avianca | Carry-on | Fits | Too big |
| British Airways | Carry-on | Fits | Too big |
| Cebu Pacific | Carry-on | Fits | Too big |
| Delta Air Lines | Carry-on | Fits | Too big |
| easyJet | Carry-on | Fits | Too big |
| Emirates | Carry-on | Fits | Too big |
| Frontier Airlines | Carry-on | Fits | Too big |
| Gol Linhas Aereas | Carry-on | Fits | Too big |
| IndiGo | Carry-on | Fits | Too big |
| JetBlue Airways | Carry-on | Fits | Too big |
| KLM | Carry-on | Fits | Too big |
| LATAM Airlines | Carry-on | Fits | Too big |
| Lufthansa | Carry-on | Fits | Too big |
| Norwegian Air Shuttle | Carry-on | Fits | Too big |
| Qantas | Carry-on | Fits | Too big |
| Qatar Airways | Carry-on | Fits | Too big |
| SAS | Carry-on | Fits | Too big |
| Southwest Airlines | Carry-on | Fits | Too big |
| Turkish Airlines | Carry-on | Fits | Too big |
| United Airlines | Carry-on | Fits | Too big |
| Vietjet Air | Carry-on | Fits | Too big |
| Volaris | Carry-on | Fits | Too big |
| WestJet | Carry-on | Fits | Too big |
| Wizz Air | Carry-on | Fits | Too big |
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Specs come from each brand's own product page. Fit uses listed dimensions in any orientation. How we score carry-on fit.