Alpha One Niner Penumbra 2.0 Backpack vs Kovered Taw 2.0 Rolltop Backpack
The Alpha One Niner Penumbra 2.0 Backpack is 21L and 1.42kg3.1lb; the Kovered Taw 2.0 Rolltop Backpack is 21L and 1.4kg3.1lb. The Kovered Taw 2.0 Rolltop Backpack is 0.02kg0lb lighter. The Alpha One Niner Penumbra 2.0 Backpack fits the carry-on limit of 36 of 36 major airlines and the Kovered Taw 2.0 Rolltop Backpack fits 36; under the seat, 1 and 7 of 26.
| Spec | Alpha One Niner Penumbra 2.0 Backpack | Kovered Taw 2.0 Rolltop Backpack |
|---|---|---|
| Price | $175 | n/a |
| Volume | 21L | 21L |
| Expands to | n/a | 27L |
| Weight | 1.42kg3.1lb | 1.4kg3.1lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 4% | 27%Best |
| Dimensions | 45.7×30.5×15.3cm18×12×6in | 45×34×12cm17.5×13.5×4.5in |
| Laptop | 15" | 17"Best |
| Compartments | n/a | 2 |
| Bottle pockets | 2 | n/a |
| Compression straps | 1 | n/a |
| Opening | top quick access zip to laptop sleeve | Roll-top, Roll-top closure with magnetic leather strap fastenings |
| Warranty | 5 years | 1 year |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | No | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | 1000D Cordura nylon body, 500D back panel and strap backing, 210D ripstop nylon lining | Heavyweight 18oz waxed cotton canvas with reclaimed leather, dual lining |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Alpha One Niner Penumbra 2.0 Backpack | Kovered Taw 2.0 Rolltop Backpack |
|---|---|---|---|
| Allegiant Air | Personal item | Too big | Fits |
| American Airlines | Personal item | Too big | Fits |
| British Airways | Personal item | Too big | Fits |
| easyJet | Personal item | Too big | Fits |
| LATAM Airlines | Personal item | Too big | Fits |
| Volaris | Personal item | Too big | Fits |
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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.