Some accessories and gear don't really have all that much to do with actual guns or shooting but are still worthy of mention.
One of those items is simple Paracord. This stuff is like duct tape. It is so handy that once you start keeping it on hand you'll wonder how you managed to get along without it.
You can get a 100 foot bundle for like $9 at most hardwares, sporting goods stores and even Amazon. 2100 foot roll can be had for less than $50!
--Get some. Keep it with your duct tape.