aThe Ice Shaker's 26oz double wall vacuum insulated bottle will hold ice for over 30 hours in a 75 degree room when filled with just ice, and the 36oz will hold ice for well over 40 hours! The Ice Shaker features a removable twist in agitator for more mixing power, a sturdy handle for easy carrying and fill lines inside the bottle for measuring!  Our custom shakers are now available in three colors, Black, White, and Hot Pink!