Modern Dayfarer DAYFARER Backpack 18L vs Zero Halliburton ZLM Medium Backpack 18L
The Modern Dayfarer DAYFARER Backpack 18L is 18L and 1.18kg2.6lb; the Zero Halliburton ZLM Medium Backpack 18L is 18L and 1.18kg2.6lb. They weigh the same. The Modern Dayfarer DAYFARER Backpack 18L costs $351 less. The Modern Dayfarer DAYFARER Backpack 18L fits the carry-on limit of 36 of 36 major airlines and the Zero Halliburton ZLM Medium Backpack 18L fits 36; under the seat, 7 and 10 of 26.
| Spec | Modern Dayfarer DAYFARER Backpack 18L | Zero Halliburton ZLM Medium Backpack 18L |
|---|---|---|
| Price | $209Best | $560 |
| Volume | 18L | 18L |
| Weight | 1.18kg2.6lb | 1.18kg2.6lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 27% | 38%Best |
| Dimensions | 44×29×16cm17.5×11.5×6.5in | 41×29×15cm16×11.5×6in |
| Laptop | 16"Best | 14" |
| Bottle pockets | 1 | n/a |
| Opening | Clamshell, full clamshell main compartment, laptop sleeve, quick-access pockets | Top-loading, Protective flap top |
| Warranty | n/a | 10 years |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | Yes | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | 100% recycled high-tenacity 420D Velocity nylon with PU backing, Fidlock V-Buckle, YKK AquaGuard zippers, Hypalon zipper pulls | CORDURA ballistic nylon |
| Last checked | 2026-10 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Modern Dayfarer DAYFARER Backpack 18L | Zero Halliburton ZLM Medium Backpack 18L |
|---|---|---|---|
| Air Canada | Personal item | Too big | Fits |
| JetBlue Airways | Personal item | Too big | Fits |
| WestJet | 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.