Here's what other sites are saying:
The perfect match for Gu's 15 serving pouches, the Energy Flask lets you take a smaller portion along with you, without sacrificing your bodies needs. PRODUCT FEATURES: High-flow nozzle Holds 5-Servings of Energy Gel Includes marks on the back to measure your fuel Designed in collaboration with Hydrapak
- Appalachian Outdoors
GU teamed up with their neighbors at HydraPak to design this handy, reusable GU Gel Energy flask with a high-flow nozzle to make fueling for long efforts more convenient, affordable and less sticky.
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The GU Flask combines squeeze-tube convenience with 5.5 ounces of GU (that's five packets, enough for a 5-hour workout). The Flask's clear plastic body lets you see how much of a charge you've got left, and it's dishwasher safe, too. Clear in color with GU logo. Weighs 0.6 ounces.
- Altrec Outdoors
The GU Flask combines squeeze tube convenience with 5.5 oz. of GU (fill with 5 packets of GU (not included), enough for a five hour workout). The flask's clear plastic body lets you see how much of a charge you have left and it's dishwasher safe too.