What to Pack For a Vacation in Cancún, From Swimwear to a High-Tech Fanny Pack

Kivy Glass Water Bottle ($14)

I never travel without a water bottle. And for big trips, I always bring electrolytes with me to keep my immune system in check (Liquid I.V. is my favorite). A clear water bottle ensures I mix in the powder well, and this option from Kivy is great because it holds 32 ounces, comes in a variety of colors, and looks fancy in my hand luggage.