The GU Flask combines squeeze-tube convenience with 5.5 ounces of GU (that’s five packets, enough for a 5-hour workout). Save money with 5.5-ounce GU Flask Filler packets. The Flask’s clear plastic body lets you see how much of a charge you’ve got left, and it’s dishwasher safe, too.
Each flask holds one Flask Filler or up to five single packets of GU Energy Gel.
