Have you got some zip ties in your kit? You should.
Unless you can tie knots one-handed in the dark without looking you should have some of these easy to use, compact, lightweight wonders.
Like duct tape, zip ties can be used for a myriad of things limited only by your imagination.
You can get the releasing type if you don't plan on carrying something that can cut through them. They don't cost much extra and can be reused until they wear out.