KNOB-ism: Why settle for one way? The Split KNOB lets you switch it up - Larger size on top, smaller part on the bottom. Versatile, clever and always ready to adapt. Product Description The Split KNOB is a 30oz/10oz tumbler made of food-grade, BPA-free 304 Stainless Steel with a double-walled, vacuum-sealed construction. This ensures up keeping your beverage cold for up to 24-hours of enjoyment. This unique tumbler has a 30oz top and a detachable 10oz bottom. The bottom portion can store many things: ice, additional liquid, snacks, keys - anything you want to store in the bottom portion of your KNOB. Other Details Made of Food-Grade, BPA-Free 304 Stainless Steel with a double-walled, and vacuum-sealed construction -insuring optimal temperatures for hours of beverage enjoyment. Uses a BPA-Free, 3-in-1 secure lid to keep the contents of your KNOB where you need it to be: open, use with a reusable straw, and rotate the silicone cover shut. Big comfortable handle to hold and carry your KNOB wherever you go. Tapered bottom to fit virtually into any cupholder. This tumbler has a liquid-gloss painted finish due to the two-piece construction…. And provides a condensation-free exterior, regardless of the temperate of your beverage inside. Reusable straw Dishwasher safe (Lids and gaskets recommended on top rack). The KNOB: Grip It. Fill It. Savor It.