Hydro Flask Stickers | Water Resistant Stickers For Water Bottles Our water bottle stickers are waterproof & come in loads of cute designs. They're perfect to use as hydro flask stickers. Hydro flask stickers are perfect for making your water bottle or flask look super cute. Choose your favourite design & coordinate it with your kids' other school stuff. Our water bottle stickers are made from a durable vinyl & are 100% waterproof. They're scratch resistant & won't fade in the sun either. Let your kids personalise their drink bottle today & look cute while they stay hydrated.