Alpha One Niner Penumbra 2.0 Backpack vs Lo & Sons Rowledge
The Alpha One Niner Penumbra 2.0 Backpack is 21L and 1.42kg3.1lb; the Lo & Sons Rowledge is 21L and 1.45kg3.2lb. The Alpha One Niner Penumbra 2.0 Backpack is 0.03kg0.1lb lighter. The Alpha One Niner Penumbra 2.0 Backpack costs $19 less. The Alpha One Niner Penumbra 2.0 Backpack fits the carry-on limit of 36 of 36 major airlines and the Lo & Sons Rowledge fits 36; under the seat, 1 and 8 of 26.
| Spec | Alpha One Niner Penumbra 2.0 Backpack | Lo & Sons Rowledge |
|---|---|---|
| Price | $175Best | $194 |
| Volume | 21L | 21L |
| Weight | 1.42kg3.1lbBest | 1.45kg3.2lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 4% | 31%Best |
| Dimensions | 45.7×30.5×15.3cm18×12×6in | 41.9×29.2×17.1cm16.5×11.5×6.5in |
| Laptop | 15"Best | 13" |
| Bottle pockets | 2 | n/a |
| Compression straps | 1 | n/a |
| Opening | top quick access zip to laptop sleeve | n/a |
| Warranty | 5 years | 1 year |
| Fit | n/a | Women's |
| Organizer | Yes | Removable |
| 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 | Yes |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | 1000D Cordura nylon body, 500D back panel and strap backing, 210D ripstop nylon lining | Water-resistant fine-weave nylon exterior, nappa leather handles and front panel, recycled poly jacquard lining, water-resistant laptop zippers |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Alpha One Niner Penumbra 2.0 Backpack | Lo & Sons Rowledge |
|---|---|---|---|
| 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 |
| JetBlue Airways | 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.