Backpackin'

 This is the best glue ever. It holds together almost anything and when it dries it is pliable and waterproof. I've added pockets to nylon hiking  and to backpacks with this stuff instead of sewing and it works perfectly. I carry some with me in a repair kit and used it recently to repair a puncture in a sleeping pad. With this and duct tape, you're pretty much set for anything. The only thing it doesn't seem to work well on is silnylon.

I usually get it at Lowe's or Home Depot.