MSR - A4 Hydration Hydro Pack

Product Code: msr-a4-hydration-harnesspack
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MSR - A4 Hydration Harnesspack

Designed specifically for off road motorcycling and mountain biking the A4 securely harnesses your hydration and your cargo to your body so it does not bounce around or slam into your body with every bump or jump. Featuring a 4 way adjustable harness system with “suspension stretch” that allows full body movement and breathing capacity. Has a 9-liter cargo space including a Elite 3 liter bladder (102 ounces). The A4 harness pack has enough room to carry snacks, inner tubes, tools, waterproof outerwear or almost anything else you might need on a long ride. Comes with a reversible, machine washable, Elite 3-liter hydration bladder which is equipped with a wide slide top opening that allows fast filling and a secure seal. To clean, simply slide open, reach in, reverse, and rinse. The bladder is BPA and PVC-free.

MSR A4 Hydro Pack Features:

  • 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 563g (20 ounces), without bladder


  • Secure 4-Point Harness
  • Large 3.0 Liter Bladder
  • Large Storage Compartment
  • Smart Device Pocket
  • Color: Black Hi-Viz and Black