For print material, people cannot click a link and must type it in manually which means UTM tags are much too long. Instead, you could create a shortened URL that redirects to the UTM tagged URL. A vanity domain is a .com that redirects and a vanity URL uses an existing domain whose subdirectory or subdomain does the redirect. For example, GearsidePromo.com (vanity domain) could redirect to a generated UTM URL, or likewise Gearside.com/promo (vanity url) could do the same thing. Both are much easier to type in for the end-user.