WATER BAGS EASY TO USE AND STORE: Our water tanks' flexible PVC material can be easily used and folded for storage, and the thick, sturdy material with well-made seams will last for years. Rodelna water bladder storage is rainproof, fireproof, abrasion-resistant, collapsible, lightweight, easy to load and unload for transportation, etc., practical! Temperature resistant up to -30~+70.