Ergon BX4


LIMITED SUPPLY! Ergon's largest gear hauling backpack for epic riding, weekends on the bike, or long commutes.  If you need to carry it on the bike, the BX4 is the proper tool for the job. No job is too small for the BX4.  Year-round commutes in New York City or a multi-week tour through the high mountains of Nepal, the BX4 has been there, done that.  If you can't fit it in the BX4, you don't need it.


  • Capacity of 2135 cu. inches
  • ‘Adaptive Carrier System’ holds the pack close to the body.
  • Self-correcting shoulder straps keep the pack centered.
  • 1 main zippered expanding compartment.
  • 4 internal organization compartments.
  • Large external helmet or wet clothes compartment.
  • Bladder compartment.
  • Rain cover included.
  • Helmet retainer.
  • A wide elastic hip strap can be adjusted with a single hand
  • Hip belt pockets.
  • HiLumen reflectors.
  • Bladder not included.


Ergon Backpack Size Chart



T-shirt size S-M



T-shirt size L-XL