One of the 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 Uses 500D Double-rip Cordura® Fabric for the ultimate combination of strength and durability Hyd