The Brown Buffalo Conceal Pack 21L vs Zero Halliburton ZEST3 Large Expandable Backpack
The The Brown Buffalo Conceal Pack 21L is 21L and 1.32kg2.9lb; the Zero Halliburton ZEST3 Large Expandable Backpack is 20L and 1.32kg2.9lb. They weigh the same. The The Brown Buffalo Conceal Pack 21L costs $321 less. The The Brown Buffalo Conceal Pack 21L fits the carry-on limit of 36 of 36 major airlines and the Zero Halliburton ZEST3 Large Expandable Backpack fits 36; under the seat, 0 and 1 of 26.
| Spec | The Brown Buffalo Conceal Pack 21L | Zero Halliburton ZEST3 Large Expandable Backpack |
|---|---|---|
| Price | $229Best | $550 |
| Volume | 21L | 20L |
| Expands to | n/a | 25L |
| Weight | 1.32kg2.9lb | 1.32kg2.9lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 0% | 4%Best |
| Dimensions | 49.5×30.5×15.2cm19.5×12×6in | 46×28×15cm18×11×6in |
| Laptop | 15" | 15.6"Best |
| Compartments | n/a | 2 |
| Opening | Clamshell, full clamshell main compartment, front and rear concealed zip compartments | n/a |
| 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 | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | Removable | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | CORDURA 1000D MultiCam Black, CORDURA 1050D ballistic nylon or Challenge UltraGrid 210D by colourway, Challenge Sailcloth EPX400, YKK RCPU2 zips | 840-denier CORDURA twill nylon with smooth leather accents |
| Last checked | 2026-10 | 2026-10 |
Where their airline fit differs
| Airline | Limit | The Brown Buffalo Conceal Pack 21L | Zero Halliburton ZEST3 Large Expandable Backpack |
|---|---|---|---|
| Frontier Airlines | 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.