I can't believe how many things I have fixed with various zip ties over the years. I probably overload on them, but, I have them tucked away in virtually every pack and kit I have.

In addition to carrying varied lengths, you can find some with molded holes on one end. They were designed to be able to put a screw through the hole and fasten a bundle of wires to a bulkhead or something, but, they are also great for a bunch of other repairs.

Zip ties almost rival duct tape, but, of course you can't make a wallet out of zip ties.