NWT never used One of our most trusted and well known minimalist 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. External fill allows for easy access to the Cruxreservoir 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 management • Six D-ring points for attaching to any armor vest or pack with MOLLE • Fully insulated reservoir compartment using 5 mm closed cell foam • Add or remove name tags and unit badges quickly with integrated hook-and-loop • Grommet drain holes located at bottom of main compartment