The Reliance Fold-A-Jug 1 Gallon Water Jug is a premium quality, collapsible water container designed specifically with backpackers in mind. The 1 gallon (4 liter) size holds enough hot or cold liquid for any daypack adventure and when you are done it collapses down to a very small size. The no glugging design feature on the cavity makes it simple to drink, and the large neck size allows you add ice easily.