ThermoBak® 3L S 100oz Mil Spec Crux

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A new low-profile solution that optimizes the space on warfighter's back by using a wider, shorter reservoir pioneered by the USMC.

color Black
  • Availability: In Stock
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ThermoBak® 3L S 100oz Mil Spec Crux

color Black
  • Availability: In Stock


The ThermoBak S3L offers the same features and functionality that warfighters have come to trust in the ThermoBak 3L, but in a new design that optimizes the space on a users back and won't interfere with a duty belt. The 3L, 100oz Mil Spec Crux reservoir delivers 25% more water per sip and the external fill allows quick access to the reservoir for refilling and cleaning.


  • Fits a broad range of torsos; shorter, broader reservoir shape does not hang below beltline
  • External fill design allows 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 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


User Group
38 x 25 x 11 cm / 14.2 x 9.8 x 4.3 in
Quick Link
Pack Weight
0.6 kg / 1.4 lb
Hydration Type
Mil Spec CRUX™ Reservoir with Quicklink™ System
Hydration Capacity
3L/100 oz