Shake things up with Ice Shaker's® 26oz. Shaker! Invested in by Mark Cuban on ABC's Shark Tank and created and used by the Gronkowski Brothers and athletes everywhere, the 26oz. Shaker is a high-quality, double wall insulated protein shaker bottle that will keep your drink cold for 30+ hours! Ice Shaker Bottle Features -5oz, 10oz, 15oz, and 20oz. measurement markings inside bottle -Kitchen-grade, stainless-steel bottle will not absorb odors -Patented, noise-free twist-on agitator -Handle built into lid for easy carrying -Fits in all standard size cup holders -BPA-free, spill-proof pop-top drink spout -Easy to clean -Sweat proof -Silicone base