Eagle Creek Tour Travel Pack 55L vs Mountainsmith Zerk 55 UL Backpack
The Eagle Creek Tour Travel Pack 55L is 55L and 1.7kg3.7lb; the Mountainsmith Zerk 55 UL Backpack is 53L and 1.59kg3.5lb. The Mountainsmith Zerk 55 UL Backpack is 0.11kg0.2lb lighter. The Eagle Creek Tour Travel Pack 55L costs $30.94999999999999 less. The Eagle Creek Tour Travel Pack 55L fits the carry-on limit of 0 of 36 major airlines and the Mountainsmith Zerk 55 UL Backpack fits 3; under the seat, 0 and 0 of 26.
| Spec | Eagle Creek Tour Travel Pack 55L | Mountainsmith Zerk 55 UL Backpack |
|---|---|---|
| Price | $249Best | $279.95 |
| Volume | 55L | 53L |
| Expands to | 62L | 58L |
| Weight | 1.7kg3.7lb | 1.59kg3.5lbBest |
| Carry-on compliance | 0% | 8%Best |
| Personal-item compliance | 0% | 0% |
| Dimensions | 64×36×28cm25×14×11in | 61×27.9×22.9cm24×11×9in |
| Laptop | 15" | no laptop sleeve |
| Bottle pockets | 1 | 2 |
| Compression straps | 0 | n/a |
| Opening | Clamshell, book-style (clamshell) | Roll-top, Roll top closure with V-strap compression |
| Warranty | Lifetime | Lifetime |
| Torso length | n/a | 40.6 to 55.9cm (16 to 22in) |
| Sizes | n/a | MD, LG |
| Organizer | Yes | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | Yes |
| Frame sheet | No | Removable |
| Water-resistant | No | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | Yes | Removable |
| Sternum strap | No | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | No |
| Camera compartment | No | No |
| Material | 100% recycled fabrics | 210D and 100D Robic nylon X-Grid Extreema (UHMWPE) ripstop with UTS coating, Spundura stretch mesh, 150D polyester liner |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Eagle Creek Tour Travel Pack 55L | Mountainsmith Zerk 55 UL Backpack |
|---|---|---|---|
| Frontier Airlines | Carry-on | Too big | Fits |
| Singapore Airlines | Carry-on | Too big | Fits |
| Southwest Airlines | Carry-on | 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.