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The Flexi-Flask collapsible water bottle from TFO solves all your hunting hydration problems simultaneously: It mutates to fit impossibly tight spaces in your backpack or it can loop onto your belt; it keeps your warm beverages warm and your cold drinks cold in Neoprene or an extra quiet Saddlecloth pouch; and it won’t impart that synthetic taste either. The flasks come in 20-ounce, 32-ounce, and 2-liter sizes, are freezable and microwaveable, and you can even boil them! Available in three camo patterns as well as solid colors. About $14.95 to $22.95, depending on size and fabric; call 888-463-5394.