33 Genius REI Products You’ll Probably Wish You’d Discovered Years Ago

1. A four-function whistle that's a compass, magnifying glass, thermometer, and, of course, emergency whistle all in one handy-dandy little tool. Perfect to clip onto your pack just in case.

Promising review: "Good multitool I like to have on my daypack. Clipped onto my sternum strap for easy access. Very lightweight." —Luis M

Price: $6.50

Continue reading to learn moure about genius REI products, written by Rachel Dunkel.