STM Saga vs. Unbox Therapy X Pacsafe 25L Anti-Theft Backpack

Two carry-on travel backpacks, compared spec for spec.

STM Saga

by Stm
Front facing view of the STM Saga
Capacity20 L
Weight0.51 kg
Dimensions44×29×15 cm
Airline fit95%
Price$60

Feature by feature

STM SagaFeatureUnbox Therapy X Pacsafe 25L Anti-Theft Backpack
Storage
N Compression N
None Expanded Capacity None
3 Opening 4
N Passport Y
N Passthrough N
Carry
Y Backpack Y
N Hip Belt N
N Sternum Strap N
Inside
N Laptop 15in
1 Main Compartments 1
Y Organizer Y
Outside
× Hard Shell ×
N Rain-fly N
2 Water Bottle Holder 2
Y Water Resistant Y
Material
100% polyester1000D Polina with wax coating, 150D Recycled polyester

Unbox Therapy X Pacsafe 25L Anti-Theft Backpack

Front facing view of the Unbox Therapy X Pacsafe 25L Anti-Theft Backpack
Capacity25 L
Weight1.05 kg
Dimensions47×32×16 cm
Airline fit92%
Price$180

Key differences between the STM Saga and Unbox Therapy X Pacsafe 25L Anti-Theft Backpack

Both have: backpack straps, built-in organizer, 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. 174 accept both. 6 accept only the STM Saga, and 0 accept only the Unbox Therapy X Pacsafe 25L Anti-Theft Backpack.

Only the STM Saga fits

Air Niugini, Air Tahiti, American Eagle, easyJet, Gulf Air, Ravn Alaska.

STM Saga vs. Unbox Therapy X Pacsafe 25L Anti-Theft Backpack: which should you pack?

The Unbox Therapy X Pacsafe 25L Anti-Theft Backpack carries 5L more than the STM Saga (20L vs. 25L), while the STM Saga is the lighter pack at 0.51kg (vs. 1.05kg). For carry-on flexibility, the STM Saga fits 95% of the airlines we track — the higher of the two. If you prioritise packing volume, choose the Unbox Therapy X Pacsafe 25L Anti-Theft Backpack; if you want to travel lighter, the STM Saga is the better call.