Boundary Supply Rennen Sling vs Fyro Citta Sling 3L
The Boundary Supply Rennen Sling is 2.5L and 0.27kg0.6lb; the Fyro Citta Sling 3L is 3L and 0.27kg0.6lb. They weigh the same. The Boundary Supply Rennen Sling costs $60 less. The Boundary Supply Rennen Sling fits the carry-on limit of 36 of 36 major airlines and the Fyro Citta Sling 3L fits 36; under the seat, 26 and 26 of 26.
| Spec | Boundary Supply Rennen Sling | Fyro Citta Sling 3L |
|---|---|---|
| Price | $59Best | $119 |
| Volume | 2.5L | 3L |
| Weight | 0.27kg0.6lb | 0.27kg0.6lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 100% | 100% |
| Dimensions | 14×25.4×7.6cm5.5×10×3in | 18×28×8cm7×11×3in |
| Laptop | no laptop sleeve | no laptop sleeve |
| Opening | zip top | Clamshell, main compartment unzips fully |
| Warranty | Lifetime | Lifetime |
| Organizer | No | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | Removable |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | RE-3 recycled Cordura Eco fabric, ripstop nylon lining with DWR | CarbonLite 330D Kodra nylon with polycarbonate coating; 100D honeycomb ripstop interior; YKK zippers, Woojin hardware |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
Both bags pass and fail the same airline size limits.
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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.