WANDRD NIMBUS 18L vs Zero Halliburton ZLM Medium Backpack 18L
The WANDRD NIMBUS 18L is 18L and 1.19kg2.6lb; the Zero Halliburton ZLM Medium Backpack 18L is 18L and 1.18kg2.6lb. The Zero Halliburton ZLM Medium Backpack 18L is 0.01kg0lb lighter. The WANDRD NIMBUS 18L costs $381 less. The WANDRD NIMBUS 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, 0 and 10 of 26.
| Spec | WANDRD NIMBUS 18L | Zero Halliburton ZLM Medium Backpack 18L |
|---|---|---|
| Price | $179Best | $560 |
| Volume | 18L | 18L |
| Weight | 1.19kg2.6lb | 1.18kg2.6lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 0% | 38%Best |
| Dimensions | 47.6×30.5×15.9cm18.5×12×6.5in | 41×29×15cm16×11.5×6in |
| Laptop | 16"Best | 14" |
| Bottle pockets | 2 | n/a |
| Opening | n/a | Top-loading, Protective flap top |
| Warranty | Lifetime | 10 years |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | No |
| Rain cover | Insert sold separately | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | Removable | No |
| Load lifters | Yes | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | No |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | n/a | CORDURA ballistic nylon |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | WANDRD NIMBUS 18L | Zero Halliburton ZLM Medium Backpack 18L |
|---|---|---|---|
| Air Canada | Personal item | Too big | Fits |
| 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 |
| 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.