We’ve all been there: you’re in the backcountry or on a long hike when you yank the zipper on your jacket and—bam!—it comes undone, gets stuck, or the whole thing rips off. You’re forced to ski or ...

Zippers are a wonderful invention that we use just about every single day. But nothing is more annoying than a zipper that won't do its job, whether the pull is stuck halfway up your jacket, the ...