Guide des tailles


12L unisex’s trail running backpack

  • Large storage capacity
  • Ergonomic chest fit with removable front system
  • Double quick access pocket
  • Versatile: for short and long distance trails
  • Ultra light
  • Comes with 2 x 500ml soft flasks with tube


Size guide


The key points

Water resistant


Inspired by the field, and designed for performance, the ULTIM 12 hydration pack offers ingenious new features to meet the needs of athletes.

The new removable front adjustment system ensures a quick, custom fit, while the wider side adjustment improves anatomical fit and stability.

Its volume allows you to carry all the equipment you need for your ultras thanks to a large central compartmentalized pocket, ideal for optimizing the organization of your equipment. The 2 back pockets accessible while running will be very useful to store your poles (vertical or horizontal according to your preferences), a jacket or a cap, without having to remove the bag.

The 3D Coolmax technology regulates humidity and provides great comfort.

The new Four Way Stretch WR (water-resistant) fabric used for the ultim 12 bag is not only water-resistant, but also tough in terms of strength.

To keep you hydrated throughout the effort, 2 flasks of 500ml with pipettes are included with the bag.

Weight (grams) 288g
Materials 3D mesh with Aiback Control system for good back ventilation
Sizes S, M, L
Settings Adjustment with side velcro to fit your bag according to its capacity and your size.
Adjustable chest and belly strap for better load distribution on the back and perfect stability.
Compartments Front:
- 1 waterproof zipped smartphone pockets with self-locking slider and passage for headphones
- 2 compartments for 2 x 500ml water bottles.
- 2 compartments in bi-elastic material for nutrition

- Central compartment segmented into several independent compartments easily accessible by two zips, one of which is vertical for quick access to equipment.
- 4 reflective loops for added security to attach a mesh accessory, to increase the volume of the bag if needed
Hydration & accessories Backpack sold with 2 Flasks of 500ml. Compartment compatible with a 1 to 2L water bag in the back.
Bag equipped with magnetic bib holder
Security Oxsitis backpacks are equipped with a whistle that is easily accessible without putting the bag down and reflective strips for added safety.

Oxsitis bags are made of technical materials with water-repellent properties.

  • Hand wash
  • No ironing
  • Do not tumble dry
  • Professional cleaning excluded
  • No bleaching

Do not use detergents or cleaning products. Wash your bag with a soft sponge.

Our advices