Ultra-distance races / Fastpacking Comfortable carry: The carry system combines zoned breathable mesh panels with the EASE 3D cushioning system to distribute pressure for breathable comfort. Ergonomic cut: Vest-style ergonomic cutting balances the weight distribution and reduces movement interference. Loading system: Internal compartments in the main chamber keep heavy items secured against the back for greater stability; a dedicated hydration bladder compartment with a direct-access zipper makes refilling quick and easy; a self-locking front zipper gives quick access to items at the bottom of the main compartment; large stretch side pockets open in two directions for easy storage and retrieval. Adjustment system: A three-point adjustment system adapts to more body shapes and user needs; the BI-FIX two-stage bottle tightening system helps to control bottle pocket tightness at any time to keep bottles stable; side compression straps compress the pack volume to keep the load secure and reduce bounce. External attachment system: Attachment points on both sides of the front panel are compatible with helmets or trail running poles. Design details: Roll-top closure provides basic water resistance for everyday scenarios and works with side webbing to add attachment options. Accessories: Comes with two 500ml TPU soft flasks. Volume: 18L Weight: approx. 280g