\u2022 The best bottle to use for mixing drinks, a must for Rego Build and Rego Rapid due to the whey protein. \n\u2022 This bottle is specially made for SiS, with handy markings that are a key part of the easy-mix system. \n\u2022 To use, start by adding drink powder up to the appropriate level, as marked on the bottle; then part fill with water and shake to mix the drink; finally top up to the final level with more water. \n\u2022 The result is no fuss, no mess, and less chance of contaminating your drink - assuming that you keep your bottle clean!. \n\u2022 An huge opening makes it the easiest mixing bottle yet to pour in powder from large tubs.\n\nSIS Protein Shaker Bottle 700ml Clear\n\nDescription\n\n--The best bottle to use for mixing drinks, a must for Rego Build and Rego Rapid due to the whey protein\n\n--This bottle is specially made for SiS, with handy markings that are a key part of the easy-mix system\n\n--To use, start by adding drink powder up to the appropriate level,.