GU Energy Gel Flask BX PSI Versatile design that works with

Versatile design that works with chains up to 12 speeds

36g (two levers + neoprene sleeve)

Independent testing has shown that larger GP5000 S TR sizes can achieve rolling resistance equal to—or even lower than—narrower versions when inflated to appropriate pressures

easy installation and packing dimensions

Compact pump with overlapping handle

GU Energy Gel Flask BX PSI Versatile design that works withWe teamed up with our neighbours at Hydrapak to design a customised soft flask with a high flow nozzle to make fueling for long efforts more convenient and less sticky. The Flask holds 5 Servings of Energy Gel and includes marks on the back to measure your fuel. Fill it with Energy Gel from our new 15 Serving pouches, fuel with it, and reuse it!