Helly Hansen Riptide Waterproof Backpack ($170)
Helly Hansen has all sorts of stuff for your next adventure — especially if your vacation is an outdoorsy one. The brand boasts a number of backpacks (and gear, in general) for all types of expeditions, whether you're going trekking through the mountains or wandering through new city streets. I love Helly Hansen for the array of rain jackets I have with its name on 'em. I trust it when Helly Hansen says something is waterproof. That's why I turn to this brand for a backpack that's waterproof, too.
Why we love it: The Riptide Waterproof Backpack is a smart carry-on for international travel because, with 23 liters of organized space, it can fit some extra outfits or safeguard electronics. It's made with TPU coating and has reinforced sealed seams to make sure that your stuff stays dry, whatever the weather (or whatever you're doing!). And it's comfortable with padded, adjustable shoulder straps, a removable and adjustable waist strap, and adjustable sternum straps.
What to keep in mind: While this backpack is considered waterproof, just be careful if it gets fully submerged in water. It's not considered completely waterproof if you're going diving into the depths of the sea, but trekking in the rain is a sure bet. While a waterproof backpack might not be necessary for a vacation to some sunnier spots, it's never a bad idea to have one handy.