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If you’re looking for a stainless steel canteen, first of all, congrats! You’re trying to help the environment by ditching one-use plastic bottles, which is awesome. Even more awesome? This eco-friendly choice pays you back for your good deed in dividends: Steel canteens are insulated, so they do a great job of keeping warm liquids warm and cold liquids cold. They’re also rust-resistant, and keep mold and bacteria at bay. (That’s particularly great if you’re someone who maybe forgets to empty out their canteen from time to time.) The best part is that when stainless steel is exposed to the sun, it won’t leach potentially harmful chemicals into your beverage. Now all you need to do is find the best canteen for you!

Top Pick

This BPA-free pick keeps beverages cold up to 24 hours and hot up to 12 hours. Hydro Flask

The best stainless steel canteens are not only completely BPA free, they keep hot liquids hot and cold liquids cold for extended periods of time—a valuable feature if you’ve ever been on a long hunt and craved a chilled drink at the end, only to realize the sun baked the water inside your plastic bottle.

Loads of Colors

No worries about spills with this leak-proof option. YETI

While the cost of some stainless steel bottles and mugs dissuades some people from buying one of their own, remember they are reusable, and if properly cared for, have a seemingly never-ending shelf life. They’re also dishwasher safe and a great gift idea if you know someone that needs to make the switch from plastic.

Perfect for Transport

Vacuum insulation keeps drinks hot or cold, and an easy flip lid makes one-handed drinking a snap. Contigo

In addition to their insulating properties and reusability, most stainless steel containers are bombproof. The lids seal tight and keep the contents from spilling, and because they’re constructed from one of the lightest and toughest metals possible, it won’t break or explode (like a plastic bottle) if accidentally knocked over or dropped.