Black Voyage Zephyr Pro 24L vs Grams28 151 Stealth Backpack
The Black Voyage Zephyr Pro 24L is 24L and 1.9kg4.2lb; the Grams28 151 Stealth Backpack is 23.5L and 2.02kg4.5lb. The Black Voyage Zephyr Pro 24L is 0.12kg0.3lb lighter. The Black Voyage Zephyr Pro 24L costs $499.02 less. The Black Voyage Zephyr Pro 24L fits the carry-on limit of 31 of 36 major airlines and the Grams28 151 Stealth Backpack fits 36; under the seat, 0 and 7 of 26.
| Spec | Black Voyage Zephyr Pro 24L | Grams28 151 Stealth Backpack |
|---|---|---|
| Price | $299.98Best | $799 |
| Volume | 24L | 23.5L |
| Weight | 1.9kg4.2lbBest | 2.02kg4.5lb |
| Carry-on compliance | 86% | 100%Best |
| Personal-item compliance | 0% | 27%Best |
| Dimensions | 46×30.5×22.5cm18×12×9in | 45×29×18cm17.5×11.5×7in |
| Laptop | sleeve, size not published | 16" |
| Opening | n/a | Clamshell, fully opening main zip, quick access front pocket |
| Warranty | Lifetime | Lifetime |
| 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 | Yes | No |
| Sternum strap | Yes | Insert sold separately |
| Load lifters | Yes | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | Yes |
| Material | Cordura 1680D ballistic nylon or X-Pac VX21; YKK water-repellent zippers; Duraflex buckles | Italian pebbled bovine leather from Gruppo Mastrotto, environment certified tanning |
| Last checked | 2026-10 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Black Voyage Zephyr Pro 24L | Grams28 151 Stealth Backpack |
|---|---|---|---|
| Air Arabia | Carry-on | Too big | Fits |
| Air India | Carry-on | 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 |
| Emirates | Carry-on | Too big | Fits |
| Frontier Airlines | Personal item | Too big | Fits |
| LATAM Airlines | Personal item | Too big | Fits |
| Ryanair | Carry-on | Too big | Fits |
| Volaris | Personal item | Too big | Fits |
| Vueling | 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.