Zippers: If the zipper track isn't staying closed, this is usually because the zipper slider pull has 'widened' over time & is no longer effectively pressing the teeth together. You can try to take a pair of pliers to 'crimp' the zipper slider on all sides (top to bottom, side to side, applying pressure across the front and back). This can often at least provide a temporary fix for a few trips. Otherwise, if your track has 2 zipper slider pulls, a tailor should be able to remove the malfunctioning one. If you'd like to add a new zipper slider pull, the biggest challenge will be finding one, since gear often uses different, proprietary sizes. Once you have a slider pull, a tailor can add it easily (~$10). If you need to replace the entire zipper track (e.g., you can't find another slider pull or the track is physically damaged), be aware this can be very expensive, expect to spend $50-100. We also recommend seeing a luggage repair specialist, since they may have the larger zippers used for gear, or Narain's & Rainy Pass Repair.
Rips, tears, holes: For small ones, you can stick on a patch of Tenacious Tape yourself. For larger ones, you may need to sew on a replacement fabric patch; most tailors can help with this (if you're doing it yourself, most technical fabrics are rip-stop nylon and this is sold by many fabric stores; most meshes used in outdoor gear however is not widely sold). Remember, sewing compromises waterproofing, since it adds punctures. Ultralight gear with thinner fabrics may require specialists. Two repair specialists are Narain's & Rainy Pass Repair; both accept gear shipped in, expect to spend $30-100
Cleaning & Waterproofing
Sometimes people are afraid to wash technical clothing for fear of removing its unique technical traits, especially its waterproof coating. Ironically, cleaning can be an essential way to keep staying dry! But the reasons are a bit complex, so we'd recommend reviewing our protip.
We have a general protip on how to store & maintain gear that we highly recommend reviewing as well. If you send us video or a good photo series, we may be able to help you evaluate your repair needs.