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The MSR A2 Hydro Pack has been discontinued and will not be returning.

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MSR A2 Hydro Pack

 The MSR A2 Hydro Pack is the “racing version” of MSR hydration systems and allows the maximum amount of liquid but with just one pocket, big enough for phone, keys, energy bar, ID and other essentials.


  • Holds 3 liters (102 ounces)
  • Hydraflex drink tube, and 45 degree bite valve
  • The solid 4-point suspension harness keeps the pack exactly where its intended - secure on your back
  • Right or left shoulder hose exits
  • Aluminized insulation helps keep body heat away from liquid
  • Reflective tabs increase safety on roads
  • Multiple elasticized compartments, inside and out, secures your cargo/tools
  • Pivoting strap connection helps eliminate binding, maximizes adjustability
  • Eliminates excess bouncing
  • Tube port compatible with hands free kit (HHF)
  • Multi size adjustable: M-XL
  • Weight 328g (11.5 ounces), without bladder
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Product Style Item # Manufacturer Product # Availability
Black / 3 Liter 1140243 361681 Out of Stock
3 Liter / Black/Orange 1140242 361680 Out of Stock