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Designed for everyday adventures, the 21 oz Standard Mouth bottle from Hydro Flask is their mid-range and most versatile product. Small enough to fit in a rucksack side pocket - or your car’s bottle holder - but carrying over 600 ml of liquid, the 21 oz insulated bottle is the perfect companion for your daily travels. Plus, since it’s made without BPA chemicals, you can keep re-using it worry-free.