Aer Sling Bag 3 vs Mountainsmith Timber Sling
The Aer Sling Bag 3 is 13.5L and 0.59kg1.3lb; the Mountainsmith Timber Sling is 12L and 0.56kg1.2lb. The Mountainsmith Timber Sling is 0.03kg0.1lb lighter. The Aer Sling Bag 3 costs $0.9500000000000028 less. The Aer Sling Bag 3 fits the carry-on limit of 36 of 36 major airlines and the Mountainsmith Timber Sling fits 32; under the seat, 10 and 0 of 26.
| Spec | Aer Sling Bag 3 | Mountainsmith Timber Sling |
|---|---|---|
| Price | $89Best | $89.95 |
| Volume | 13.5L | 12L |
| Weight | 0.59kg1.3lb | 0.56kg1.2lbBest |
| Carry-on compliance | 100%Best | 89% |
| Personal-item compliance | 38%Best | 0% |
| Dimensions | 25×43×15cm10×17×6in | 27.9×48.3×20.3cm11×19×8in |
| Laptop | 13" | no laptop sleeve |
| Opening | n/a | Dual side access to the main compartment |
| Warranty | Lifetime | Lifetime |
| Organizer | No | Yes |
| Shoe compartment | Yes | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | No | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | 1680D Cordura ballistic nylon exterior, antimicrobial-treated interior liner, YKK zippers, Duraflex plastic hardware | 610D HP Cordura, YKK zippers |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Aer Sling Bag 3 | Mountainsmith Timber Sling |
|---|---|---|---|
| Air Arabia | Carry-on | Fits | Too big |
| Air Canada | Personal item | Fits | Too big |
| Air India | Carry-on | Fits | Too big |
| Allegiant Air | Personal item | Fits | Too big |
| American Airlines | Personal item | Fits | Too big |
| British Airways | Personal item | Fits | Too big |
| easyJet | Personal item | Fits | Too big |
| Frontier Airlines | Personal item | Fits | Too big |
| JetBlue Airways | Personal item | Fits | Too big |
| LATAM Airlines | Personal item | Fits | Too big |
| Ryanair | Carry-on | Fits | Too big |
| United Airlines | Personal item | Fits | Too big |
| Volaris | Personal item | Fits | Too big |
| Vueling | Carry-on | 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.