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You Should Definitely Be Buying These Things At Costco

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23. Water Bottles
You know it's a good idea to stay hydrated throughout the day, but you're probably also aware that buying bottled water creates a lot of plastic pollution. So, using a reusable water bottle is really the thing to do. In store, this pair of high-quality ThermoFlask water bottles is just $22.99. On Amazon, a single ThermoFlask water bottle sells for $23.70. No question, Costco is the place to buy this product.