STM Prime vs. Deuter Speed Lite 25

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

STM Prime

Front facing view of the STM Prime
Capacity15 L
Weight0.7 kg
Dimensions42×26×13 cm
Airline fit96%
Price$80

Feature by feature

STM PrimeFeatureDeuter Speed Lite 25
Storage
N Compression 4
None Expanded Capacity None
0 Opening 0
top Passport top
N Passthrough N
Carry
Y Backpack Y
N Hip Belt Y
Y Sternum Strap Y
Inside
13in Laptop N
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

Deuter Speed Lite 25

Capacity25 L
Weight0.7 kg
Dimensions56×28×19 cm
Airline fit47%
Price$120

Key differences between the STM Prime and Deuter Speed Lite 25

Both have: passport pocket, backpack straps, sternum strap, 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. 89 accept both. 92 accept only the STM Prime, and 0 accept only the Deuter Speed Lite 25.

Only the STM Prime fits

Aer Lingus, Aeroflot, Aerolineas Argentinas, Aeromexico, Air Baltic, Air Canada, Air Caraibes, Air China, Air France, Air India, Air Malta, Air Mauritius, Air Niugini, Air Serbia, Air Seychelles, Air Tahiti, All Nipon Airways, American Eagle, ANA, Asiana Airlines, ATA Airlines, Austrian, Azerbaijan Airlines, Belavia, Blue Air, Boliviana de Aviacion, Brussels Airlines, Bulgaria Air, China Eastern, Czech Airlines, easyJet, Emirates Airlines, Enter Air, Ethiopian Airlines, Etihad Airways, Eurowings, Fiji Airways, Flair Air, flybe, Gol Linhas Aereas, Gulf Air, Iberia, Icelandair, Indigo, InselAir, Interjet, Iran Air, Japan Airlines, Jet Airways, Juneyao Airlines, Kenya Airways, KLM, LATAM , Liat Airlines, LOT Polish, Lufthansa, Luxair, Mahan Air, Meridiana Fly, Mesa Airlines, Nordwind Airlines, Norwegian, Oman Air, Pakistan International, Peach, Porter Airlines, Qatar Airways, Ravn Alaska, Regional Express, Royal Brunei Airlines, Royal Jordanian, Ryanair, S7, SAS Scandinavian, Scoot, Shandong Airlines, Shenzhen Airlines, Sky Airlines, Sun Express, Swiss Int'l Air Lines, TAP Air Portugal, TAROM, Tianjin Airlines (A320 & E190), Tiger Airways, TUI, Turkish Airlines, Ukraine International, VIM Airlines (Closed), Virgin Australia, Volotea, WestJet, Xiamen.

STM Prime vs. Deuter Speed Lite 25: which should you pack?

The Deuter Speed Lite 25 carries 10L more than the STM Prime (15L vs. 25L), while the STM Prime is the lighter pack at 0.7kg (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 Deuter Speed Lite 25; if you want to travel lighter, the STM Prime is the better call.