Hynes Eagle Carry-On Travel Backpack 40L vs Mountainsmith Zerk 40 UL Backpack
The Hynes Eagle Carry-On Travel Backpack 40L is 40L and 1kg2.2lb; the Mountainsmith Zerk 40 UL Backpack is 40L and 0.97kg2.1lb. The Mountainsmith Zerk 40 UL Backpack is 0.03kg0.1lb lighter. The Hynes Eagle Carry-On Travel Backpack 40L costs $174.95999999999998 less. The Hynes Eagle Carry-On Travel Backpack 40L fits the carry-on limit of 30 of 36 major airlines and the Mountainsmith Zerk 40 UL Backpack fits 30; under the seat, 0 and 0 of 26.
| Spec | Hynes Eagle Carry-On Travel Backpack 40L | Mountainsmith Zerk 40 UL Backpack |
|---|---|---|
| Price | $54.99Best | $229.95 |
| Volume | 40L | 40L |
| Expands to | n/a | 44L |
| Weight | 1kg2.2lb | 0.97kg2.1lbBest |
| Carry-on compliance | 83% | 83% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 50.8×33×22.9cm20×13×9in | 50.8×30.5×22.9cm20×12×9in |
| Laptop | 15" | no laptop sleeve |
| Bottle pockets | 1 | 2 |
| Opening | n/a | Roll-top, Roll top closure with V-strap compression |
| Warranty | 1 year | Lifetime |
| Torso length | n/a | 40.6 to 53.3cm (16 to 21in) |
| Organizer | Yes | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | Yes |
| Frame sheet | No | Removable |
| Water-resistant | Yes | No |
| Rain cover | No | No |
| 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 | No |
| Material | Water-repellent fabric | 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
Both bags pass and fail the same airline size limits.
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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.