Mountainsmith Zerk 20 UL Daypack vs Stubble & Co Motion Backpack 20L
The Mountainsmith Zerk 20 UL Daypack is 20L and 0.79kg1.7lb; the Stubble & Co Motion Backpack 20L is 20L and 0.78kg1.7lb. The Stubble & Co Motion Backpack 20L is 0.01kg0lb lighter. The Stubble & Co Motion Backpack 20L costs $4.949999999999989 less. The Mountainsmith Zerk 20 UL Daypack fits the carry-on limit of 36 of 36 major airlines and the Stubble & Co Motion Backpack 20L fits 36; under the seat, 1 and 0 of 26.
| Spec | Mountainsmith Zerk 20 UL Daypack | Stubble & Co Motion Backpack 20L |
|---|---|---|
| Price | $179.95 | $175Best |
| Volume | 20L | 20L |
| Expands to | 23L | n/a |
| Weight | 0.79kg1.7lb | 0.78kg1.7lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 4%Best | 0% |
| Dimensions | 45.7×25.4×15.2cm18×10×6in | 48×29×14.5cm19×11.5×5.5in |
| Laptop | no laptop sleeve | 17" |
| Bottle pockets | 2 | 2 |
| Opening | Roll-top, Roll top closure with V-strap compression | Dual-access zippered main compartment |
| Warranty | Lifetime | 2 years |
| Torso length | 38.1 to 48.3cm (15 to 19in) | n/a |
| Organizer | No | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | Yes | Yes |
| Frame sheet | Removable | No |
| Water-resistant | No | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | Removable | Hideable |
| Sternum strap | Yes | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | 210D and 100D Robic nylon X-Grid Extreema (UHMWPE) ripstop with UTS coating, 840D x 100D stretch mesh, 150D polyester liner | Recycled 210D nylon mini ripstop and 420D x 600D two-tone ripstop, 4-way stretch nylon pockets, water-repellent reverse coil zips |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Mountainsmith Zerk 20 UL Daypack | Stubble & Co Motion Backpack 20L |
|---|---|---|---|
| Frontier Airlines | Personal item | Fits | Too big |
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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.