Alpha One Niner Evade 1.5 Backpack, Gen 3 vs Think Tank Shape Shifter 25L
The Alpha One Niner Evade 1.5 Backpack, Gen 3 is 25L and 1.7kg3.7lb; the Think Tank Shape Shifter 25L is 25L and 1.72kg3.8lb. The Alpha One Niner Evade 1.5 Backpack, Gen 3 is 0.02kg0lb lighter. The Alpha One Niner Evade 1.5 Backpack, Gen 3 costs $50.75 less. The Alpha One Niner Evade 1.5 Backpack, Gen 3 fits the carry-on limit of 36 of 36 major airlines and the Think Tank Shape Shifter 25L fits 36; under the seat, 0 and 8 of 26.
| Spec | Alpha One Niner Evade 1.5 Backpack, Gen 3 | Think Tank Shape Shifter 25L |
|---|---|---|
| Price | $249Best | $299.75 |
| Volume | 25L | 25L |
| Weight | 1.7kg3.7lbBest | 1.72kg3.8lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 0% | 31%Best |
| Dimensions | 47×30×18cm18.5×12×7in | 43×30×17.9cm17×12×7in |
| Laptop | 16"Best | 15" |
| Compartments | 4 | n/a |
| Bottle pockets | 2 | n/a |
| Opening | Top-loading, top zip | n/a |
| Warranty | 5 years | Lifetime |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | No |
| Rain cover | No | Yes |
| MOLLE | Yes | No |
| Hip belt | No | Removable |
| Sternum strap | No | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | Yes |
| Material | Challenge Ultra 400TX, Dimension-Polyant X42, or 500D Nylon with 200D UHMWPE ripstop nylon lining | 420D Velocity nylon, 300D diamond weave polyester, 600D polyester |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Alpha One Niner Evade 1.5 Backpack, Gen 3 | Think Tank Shape Shifter 25L |
|---|---|---|---|
| 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 |
| 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.