Alpha One Niner Whitley Backpack vs Black Ember Citadel R3 20
The Alpha One Niner Whitley Backpack is 20L and 1.21kg2.7lb; the Black Ember Citadel R3 20 is 20L and 1.25kg2.8lb. The Alpha One Niner Whitley Backpack is 0.04kg0.1lb lighter. The Alpha One Niner Whitley Backpack costs $26 less. The Alpha One Niner Whitley Backpack fits the carry-on limit of 36 of 36 major airlines and the Black Ember Citadel R3 20 fits 36; under the seat, 0 and 7 of 26.
| Spec | Alpha One Niner Whitley Backpack | Black Ember Citadel R3 20 |
|---|---|---|
| Price | $219Best | $245 |
| Volume | 20L | 20L |
| Weight | 1.21kg2.7lbBest | 1.25kg2.8lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 0% | 27%Best |
| Dimensions | 47×27.9×15.2cm18.5×11×6in | 44×30×17cm17.5×12×6.5in |
| Laptop | 16"Best | 14" |
| Opening | main compartment zip, quick access zip behind carry handle | main compartment zip, separate suspended laptop sleeve |
| Warranty | 5 years | Lifetime |
| 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 | Removable | Removable |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | No |
| Material | Dimension-Polyant X42, 500D or 1050D ballistic nylon with 200D Crimson Wave lining | EmberTex PFAS-free 1220x600D nylon 6 with bonded laser-cut Hypalon panels, 200D ripstop nylon lining, YKK Aquaguard zippers, T6 anodized aluminum hardware |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Alpha One Niner Whitley Backpack | Black Ember Citadel R3 20 |
|---|---|---|---|
| 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 |
| Frontier Airlines | 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.