Ranger Rick has some great tips for putting together mini survival kits, necklaces, etc. His advice is practical and comes from years of experience doing outdoors stuff for a living.
His Ranger Digests are a treasure. In the military some of the required equipment is a bit heavy and the guys need to be a bit rough. For one branch of Special Ops, the base weight is 120 lbs, not including items of specialty. They also are trained to be without resupply for one year. So one place to prune the weight is many of the traditional backpacking luxuries. And they have lots of knowledge on how to make do without. It’s useful to farm this knowledge for useful tidbits and outdoor mindset.
Not all paracord is created equal. 550 paracord is the one to get. It has several individual inner cords that can be used separately as well as only using the outer sheath.
Update: Rick is updating his site. Some of his pics and ideas to accessorize more useful stuff to the little things you already carry have been temporarily removed. My appreciation for the engineered functionality, strength, and low cost to fishing tackle definitely increased after all the things I saw him doing with it many years ago.