Hydro Flask 64oz Wide Mouth bottle. Whether you’re overnighting near Yellowstone or car camping at a festival, the64 oz Wide Mouth bottle makes sure there’s more than enough refreshment to go around. TempShield™ insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours. Durable 18/8 Pro-Grade Stainless Steel constuction. BPA-Free and Phthalate-Free. Wide mouth opening fits many third-party water filters and allows faster fill and flow. Compatible with the Hydro FlipTM Lid and Wide Mouth Straw Lid. Mouth Diameter 2.28". Imported.