STM Trilogy vs. Ryu Flex Pack 20L
Two carry-on travel backpacks, compared spec for spec.
Feature by feature
| STM Trilogy | Feature | Ryu Flex Pack 20L |
|---|---|---|
| Storage | ||
| N | Compression | N |
| None | Expanded Capacity | None |
| 4 | Opening | 4 |
| N | Passport | N |
| N | Passthrough | N |
| Carry | ||
| Y | Backpack | Y |
| N | Hip Belt | N |
| N | Sternum Strap | removable |
| Inside | ||
| 15in | Laptop | 15in |
| 1 | Main Compartments | 1 |
| Y | Organizer | Y |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2 | Water Bottle Holder | 1 |
| Y | Water Resistant | Y |
| Material | |
| 100% polyester | 100% nylon with silicone coating and Polygiene® finish |
Key differences between the STM Trilogy and Ryu Flex Pack 20L
- Sternum strap: No on the STM Trilogy; Removable on the Ryu Flex Pack 20L.
- Water bottle pockets: 2 on the STM Trilogy; 1 on the Ryu Flex Pack 20L.
Both have: backpack straps, laptop sleeve, built-in organizer, water resistant.
Which airlines take each bag as a carry-on
We checked both bags against the carry-on size limits of 189 airlines. 177 accept both. 1 accept only the STM Trilogy, and 0 accept only the Ryu Flex Pack 20L.
Only the STM Trilogy fits
Air Niugini.
STM Trilogy vs. Ryu Flex Pack 20L: which should you pack?
The STM Trilogy carries 4L more than the Ryu Flex Pack 20L (24L vs. 20L), and the two are closely matched on weight. For carry-on flexibility, the STM Trilogy fits 94% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the STM Trilogy; if you want to travel lighter, the STM Trilogy is the better call.