SAVE $10: As of July 30, select colors of the 40oz Owala FreeSip Tumbler are on sale for $34.98 at Amazon. That's $10.01 off their list price of $44.99.

If you're spending a lot of time in the heat this summer, it's important to stay hydrated.

As of July 30, a selection of 40oz Owala FreeSip Tumblers are on sale for $34.98 at Amazon. That's just over $10 off their full price of $44.99. And as for what colors are on sale at this price, you can choose between strawberry fields, summer sweetness, foggy tide, daybreak, and iced breeze. Some are even at their lowest-ever price with this deal.

There's also a selection of colors on sale for $35.99, if your favorite color isn't on the maximum discount.

This durable stainless-steel tumbler is ready to join you on your summer adventures this year. Alongside its sturdy build, it has a versatile design. With its 2-in-1 FreeSip spout, you can either drink through a built-in straw or tilt it back to drink from the spout. Its push-button lid also helps keep the spout clean.

For keeping your drink cold, the Owala FreeSip Tumbler features double-wall insulation. This can keep it cool for up to 24 hours, which is great news if you're taking it along for longer periods in the day.

Some colors are marked as limited-time deals right now, so act fast to save on these 40oz Owala FreeSip Tumblers at Amazon.

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Hannah Hoolihan is a freelance writer with Mashable. She’s written for various entertainment websites since 2017, covering everything from tech to games to film. You’ll currently find her work on IGN and Fangoria alongside Mashable, but she also has bylines at Rock Paper Shotgun, Collider, Screen Rant, and more. When she’s not writing, she enjoys catching up with the latest films and shows — horror, in particular — and has a deep love of FromSoft games, which she continues to happily replay.