It can be tough to get that fish tank taste out of your favorite water bottle but the Strive Advance from OXO has a solution. The bottle unscrews in the middle, making it easier to clean. Much easier to add ice, too. The lid has a smaller opening for spill-free sipping & is tethered to the bottle. the 24-ounce bottle is made of BPA-free & dishwasher safe Tritan plastic.