We all know the old “rule of threes” when it comes to survival: you can last 3 hours without shelter in a harsh environment, 3 days without water, and 3 weeks without food, but if you don’t start worrying about staying hydrated before a survival situation arises, you’re already in for a world of hurt.

That’s why Rad doesn’t go anywhere without a reliable water source–this week, he’s rocking the Stow-Collapsible Hydrapak Water Bottle. What’s Rad think of this collapsible canteen? We’ll let him tell you for himself.

Get your own Stow-Collapsible Hydrapak Water Bottle below!

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