Using this Hydro Flask tandem cooler cup is easy. For cans, just place them inside and use the collar to keep them in place and locked in cold. You can also use it as a regular 26 - ounce beverage cup for your hot or cold drinks. When it comes to maintenance, since it's dishwasher - safe, you can simply pop it in the dishwasher for a thorough clean. However, to keep the powder coat looking good, avoid using abrasive cleaners. Store it in a cool, dry place when not in use. Always check the cup for any signs of damage before each use, and if you notice any cracks or dents, it's best to replace it.