External fill allows for easy access to the Crux reservoir for easy filling, cleaning and ice addition
Two-zipper fill cover provides top or bottom of reservoir compartment entry points
Quick-release shoulder straps unclip for easy removal and stow away inside built-in pocket
Adjustable sternum strap
Hook-and-loop strap managementOne of our most trusted and well known packs, the ThermoBak 3L continues to impress with updated features and technology. The new 3L, 100oz Mil Spec Crux Reservoir delivers 25% more water per sip while the style maintains the ergonomics and optimal infrared reflectivity it’s famous for.
