A lightweight classic for mountain running and endurance events
Originally developed in 1973 to a specification by Olympian and London Marathon founder Sir Chris Brasher, the OMM Classic 18 has become one of the best-known mountain running backpacks. Designed for mountain marathons, it is equally suited to trail running, hiking, fastpacking and multi-day endurance events.
With an 18-litre capacity, the Classic 18 balances lightweight performance with practical storage. The pack features a large main compartment with a hydration sleeve, stretch mesh pockets for quick-access equipment, zipped storage on both the lid and waist belt, and a removable waist belt that can be adapted to suit different activities.
An EVA padded shoulder harness, removable back pad and adjustable chest strap help provide comfort and stability over uneven terrain, while the integrated whistle adds an extra safety feature for mountain use.
Features
- 18-litre capacity
- Lightweight mountain running backpack
- Hydration compatible
- EVA padded shoulder harness
- Removable waist belt
- Removable back pad (Duomat)
- Large rear stretch mesh pocket
- Stretch mesh side pockets
- Zipped lid pocket
- Two zipped waist belt pockets
- Universal Gear Rail (UGR) attachment system
- Whistle integrated into chest strap
- High-wicking mesh back and hip panels
- Side compression cords
- Aluminium tent pegs that double as bottle openers
Technical Details
- Capacity: 18L
- Back length: 42cm
- Full weight: 480g
- Lean weight: 350g
- Materials: Nylon, TPU reinforced nylon, 3D Airmesh, stretch mesh
- Hydration compatible: Yes
Designed For
Designed for: Mountain marathons, trail running, ultramarathons, fell running, fastpacking, hiking, trekking, adventure racing and endurance events.















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