STM Prime vs. Alchemy Equipment Daypack
Two carry-on travel backpacks, compared spec for spec.
STM Prime
| Capacity | 15 L |
| Weight | 0.7 kg |
| Dimensions | 42×26×13 cm |
| Airline fit | 96% |
| Price | $80 |
Feature by feature
| STM Prime | Feature | Alchemy Equipment Daypack |
|---|---|---|
| Storage | ||
| N | Compression | N |
| None | Expanded Capacity | None |
| 0 | Opening | 2 |
| top | Passport | front |
| N | Passthrough | N |
| Carry | ||
| Y | Backpack | Y |
| N | Hip Belt | N |
| Y | Sternum Strap | Y |
| Inside | ||
| 13in | Laptop | 13in |
| 2 | Main Compartments | 2 |
| N | Organizer | N |
| Outside | ||
| × | Hard Shell | × |
| N | Rain-fly | N |
| 2, side | Water Bottle Holder | 2, side |
| Y | Water Resistant | Y |
| Material | |
| Polyester | Waxed 600 denier Kodra (100% polyester) Embossed lining (100% polyester) Base: 3x PU-coated 900 denier Kodra |
Alchemy Equipment Daypack
| Capacity | 20 L |
| Weight | 0.6 kg |
| Dimensions | 43×36×13 cm |
| Airline fit | 86% |
| Price | $150 |
Key differences between the STM Prime and Alchemy Equipment Daypack
- Opening: Other on the STM Prime; Rolltop on the Alchemy Equipment Daypack.
- Passport pocket: Top on the STM Prime; Front on the Alchemy Equipment Daypack.
Both have: backpack straps, sternum strap, laptop sleeve, water bottle pockets, water resistant.
Which airlines take each bag as a carry-on
We checked both bags against the carry-on size limits of 189 airlines. 162 accept both. 19 accept only the STM Prime, and 0 accept only the Alchemy Equipment Daypack.
Only the STM Prime fits
Aerolineas Argentinas, Air France, Air India, Air Mauritius, Air Niugini, Air Tahiti, Boliviana de Aviacion, Cayman Airways, flybe, Great Lakes Airlines, Indigo, InselAir, Jet Airways, Kenya Airways, KLM, LATAM , Regional Express, Sky Airlines, Virgin Australia.
STM Prime vs. Alchemy Equipment Daypack: which should you pack?
The Alchemy Equipment Daypack carries 5L more than the STM Prime (15L vs. 20L), while the Alchemy Equipment Daypack is the lighter pack at 0.6kg (vs. 0.7kg). For carry-on flexibility, the STM Prime fits 96% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Alchemy Equipment Daypack; if you want to travel lighter, the Alchemy Equipment Daypack is the better call.