Using your Hydro Flask Tandem Cooler Cup is easy. You can place two standard 12 - oz. cans in it to keep them insulated. Or, use it as a 26 - oz. beverage cup for your hot or cold drinks. When using it with cans, make sure the Cooler Cup Collar fits snugly to lock in the cold. The cup fits most cupholders, so you can take it with you in your car or other places. For maintenance, it's dishwasher safe, but it's also okay to wash it by hand. Just use a mild detergent. Remember, it's BPA - Free and Toxin - Free, so it's safe for your drinks. Keep it away from sharp objects to avoid scratching the Color Last™ powder coat.