Hyperlite Mountain Gear Unbound 55L Ultralight Backpack

The Unbound is Hyperlite Mountain Gear's redesigned thru-hiking pack, built from Dyneema® Woven Composite 3.9 for an ultralight, highly abrasion-resistant carry. This 55L version scales up the design for longer resupply gaps and heavier loads, while keeping the same dual-entry stretch-mesh front pocket, twin side bottle pockets and bottom stash pocket for gear you need on the move. Removable, contoured aluminium stays and a V-Pull hip belt add structure and support, and wider, naturally curved shoulder straps and adjustable roll-top compression straps round out the carry system. Suits thru hikes, multi-day trips and long-distance trails where low pack weight matters most. Features Dyneema® Woven Composite 3.9 main body fabric — puncture and abrasion-resistant, with internal seam taping. 100D Dyneema® Gridstop reinforcement in high-wear zones. Dual-entry Dyneema® Stretch Mesh front pocket for quick-access, on-the-move storage. Large side bottle pockets for one-handed access to water and other essentials. Bottom stash pocket for wet or frequently used gear. Two removable, contoured aluminium stays for structure and load transfer. Removable hip belt with V-Pull cinch system and cushioned padding for heavier loads. Roll-top closure with removable, adjustable compression straps for volume control and securing trekking poles or oversized bottles. Low-profile, sewn-in daisy chains (vertical and horizontal) for external gear attachment. Wider, naturally curved shoulder straps for comfort under load. Five torso-fit sizes (XS-Tall) to dial in the carry. Taller body than the 40L version for longer resupply stretches and bulkier gear. Rated to carry up to 18kg (40lb). Specifications Weight 819g (28.9oz), size Medium average — will vary slightly by torso size Volume 55L total, including 9L combined external pocket volume (front, side and bottom pockets) Torso Fit Range XS (under 38cm / 15in), S (38-43cm / 15-17in), M (43-48cm / 17-19in), L (48-53cm / 19-21in), Tall (over 53cm / 21in+) Materials Dyneema® Woven Composite 3.9 (main body), 100D Dyneema® Gridstop (reinforcement), Dyneema® Stretch Mesh (pockets) Frame Type Two removable, contoured aluminium stays Access Style Roll-top, adjustable volume Pockets/Compartments 1 Main Compartment, 1 Dual-Entry Front Stretch Mesh Pocket, 2 Side Bottle Pockets, 1 Bottom Stash Pocket (9L combined external pocket volume) Max Load 18kg (40lb) Colour Black, White