One thing I always keep around is 550 cord better known as parachute cord or paracord. This stuff is extremely handy. I keep it in the car and in my bug out bag. This is a lightweight cord that consists of a shell that encloses seven strands of a lighter cord. Each one of the inner cords consists of smaller strands woven together. Paracord typically measures 5/32″ in diameter. If it has fewer than seven strands, it is not Mil Spec 550 Cord. Mil Spec cord has a breaking strength of 550 lbs. Beware there is a lot of phony cord on the market.
Today it is used as a general purpose utility cord by military personnel. Typical uses include attaching equipment to harnesses, as lanyards to avoid losing small or important items, tying rucksacks and equipment to vehicle racks, securing camouflage nets to trees or vehicles. It is great for setting up improvised shelters. With a poncho and a few feet of cord you have a shelter.
The strands from the interior can be removed when finer strings or thread are needed. It can be used as sewing thread to repair clothing or gear. The interior strands work well as fishing line or to make snares. The ends of the cord should always be melted to prevent fraying.
I typically buy it in 1000-foot rolls and a good quality paracord should be manufactured to Mil-C-5040H Type III standards and be made in the USA. You should be able to buy a 1000 foot roll for about $50.00. If you don’t have a hank of this in your bug out bag you are missing the boat.