Hydro Flask 21 Oz Standard Flex Straw Cap is an insulated drinks bottle that keeps your drink cold or warm for a long time, whether used daily or on the go. The bottle is built with double-wall vacuum insulation that preserves cold drinks for up to 24 hours and warm drinks for up to 12 hours, making it well suited for training, outdoor activities and travel.

The bottle is made from durable 18/8 Pro Grade stainless steel that does not absorb flavours or odours, and the powder-coated surface provides a secure grip and increased durability. The Flex Straw Cap lid is designed for easy drinking and is leakproof, so the bottle can safely be carried in a rucksack or bag. TempShield™ technology prevents condensation on the outside and helps maintain a stable temperature of the contents.

The bottle is BPA-free, dishwasher safe and has a volume of approximately 0.6 litres.