That nifty GU flask you picked up in a fit of frustration after finding yet another sticky ball of forgotten gel packets nesting in a jersey pocket on laundry day doesn't do any good unless it's filled with delicious, energy-infusing nectar straight from your GU Energy Gel Bulk Pack. This pack lets you choose your serving size and eliminates worries of errant wrappers and sugary pockets whether you're hammering out hours of TT practice under the summer sun or clipping in for a casual Sunday social noodle in the mountains.