GORUCK uses YKK zippers, which are the best in the world. Over time, excessive abrasion will render even these zippers less than fully functional. To do a full zipper replacement would take approximately three hours at our factory in Bozeman, Montana, so we do not do full zipper replacements. However, if your zipper fails, please contact us and we’ll see what we can do to get you back to ruckin’ at a discount. ZipCare can help; think of it as oil for your ruck’s engine. Try it first before you contact us.