Nomatic Backpack (20L) vs Think Tank Retrospective Backpack 15
The Nomatic Backpack (20L) is 20L and 1.8kg4lb; the Think Tank Retrospective Backpack 15 is 20L and 1.8kg4lb. They weigh the same. The Think Tank Retrospective Backpack 15 costs $30.24000000000001 less. The Nomatic Backpack (20L) fits the carry-on limit of 36 of 36 major airlines and the Think Tank Retrospective Backpack 15 fits 36; under the seat, 0 and 8 of 26.
| Spec | Nomatic Backpack (20L) | Think Tank Retrospective Backpack 15 |
|---|---|---|
| Price | $319.99 | $289.75Best |
| Volume | 20L | 20L |
| Expands to | 24L | n/a |
| Weight | 1.8kg4lb | 1.8kg4lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 0% | 31%Best |
| Dimensions | 47×30×14cm18.5×12×5.5in | 40.5×30×18cm16×12×7in |
| Laptop | 16"Best | 15" |
| Bottle pockets | 2 | 2 |
| Opening | Clamshell, full-perimeter zip | Panel access, top + back panel access |
| Warranty | 5 years | Lifetime |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | Yes |
| Rain cover | No | Yes |
| MOLLE | No | No |
| Hip belt | No | Removable |
| Sternum strap | No | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | No |
| Camera compartment | No | Yes |
| Bike-ready | No | No |
| Material | Water-resistant tarpaulin (75% Polyester / 25% Nylon) | Sand-washed cotton canvas with DWR and PU coating |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Nomatic Backpack (20L) | Think Tank Retrospective Backpack 15 |
|---|---|---|---|
| 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.