New Hydro Flask 40 oz Wide Mouth Insulated Stainless Water Bottle Starfish. This item comes new and has never been used before. This is a 40 Oz wide mouth Hydro Flask in Starfish Yellow with a wide mouth drinking spout. This hydration water bottle is made of pro-grade stainless steel, BPA & Toxin free, and dishwasher safe. This has a TempShield which is a double wall vacuum insulation that keeps cold drinks cold for 24 hours and hot drinks hot for 12 hours.