Repair nearly any piece of gear on the fly with Tenacious Tape. It goes on clear, doesn't leave residue, and is removable. This tape's so tough you'll need scissors or a razor blade to cut it //
Ultimate EDC Survival Kit Infographic! Download the high-resolution version here: http://www.bugoutchannel.com/ultimate-edc-survival-kit/ What the video here: https://youtu.be/Uff_R8jhoXg
550 Paracord Sling. Its not a DIY but it's also not that expensive and if you are already handy with knots and paracord, you could make this by studying the patterns.