Proozy's very popular Buy One Hydro Flask, Get One Free deal is back! Last time this sold out in a few days so don't miss out! Mix and match any two styles or colors available and the cheaper one will be the free one. Click here to shop and get the BOGO + FS deal using the promo code PZYHFBOGO-FS at checkout. Deal ends 5/4 or sooner if stock runs out.