KNKG APEX Backpack Large vs Lowe Alpine Sirac Plus 40
The KNKG APEX Backpack Large is 40L and 1.9kg4.2lb; the Lowe Alpine Sirac Plus 40 is 40L and 1.77kg3.9lb. The Lowe Alpine Sirac Plus 40 is 0.13kg0.3lb lighter. The KNKG APEX Backpack Large fits the carry-on limit of 1 of 36 major airlines and the Lowe Alpine Sirac Plus 40 fits 0; under the seat, 0 and 0 of 26.
| Spec | KNKG APEX Backpack Large | Lowe Alpine Sirac Plus 40 |
|---|---|---|
| Price | $240 | n/a |
| Volume | 40L | 40L |
| Expands to | 45L | n/a |
| Weight | 1.9kg4.2lb | 1.77kg3.9lbBest |
| Carry-on compliance | 3%Best | 0% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 45×32×28cm17.5×12.5×11in | 75×36×28cm29.5×14×11in |
| Laptop | 16" | n/a |
| Compartments | n/a | 2 |
| Bottle pockets | 2 | 2 |
| Opening | Top-loading, Top opening plus an extra flat-lay opening compartment | Top-loading, Lidded top opening plus zipped front and lower entry, with an internal divider |
| Warranty | 25 years | n/a |
| Organizer | No | No |
| Shoe compartment | Yes | No |
| Hydration sleeve | No | Yes |
| Frame sheet | No | No |
| Water-resistant | No | No |
| Rain cover | No | Removable |
| MOLLE | No | No |
| Hip belt | Removable | Yes |
| Sternum strap | Removable | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | No |
| Camera compartment | No | No |
| Material | 1680D ballistic nylon body, ripstop nylon lining, YKK Vislon zippers, powder-coated steel hardware | Recycled fabrics |
| Last checked | 2026-10 | 2026-10 |
Where their airline fit differs
| Airline | Limit | KNKG APEX Backpack Large | Lowe Alpine Sirac Plus 40 |
|---|---|---|---|
| Singapore Airlines | 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.