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MSR A4 Hydro Pack

The MSR A4 harness pack delivers 9-liters of cargo space and includes a Elite 3 liter bladder (102 ounces) which is enough room to carry snacks, inner tubes, tools, waterproof outerwear or almost anything else you might need on a long ride.


  • 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
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Product Style Item # Manufacturer Product # Availability
Black / 9 Liter 1140253 361683 In Stock: Ships next business day
Black/Hi-Viz / 9 Liter 1140252 361682 In Stock: Ships next business day