I have, and use, one of the original kits. I understand they are now cherished by collectors. I have found them to be very useful, and the weight and bulk are miniscule. Super glue and duct tape are handy, as well, but some items are best repaired or modified with needle and thread.
It is fairly easy to assemble your own, perfectly functional version at any sewing shop, except for the very nice,tiny awl. You will be glad you have that when you rip something major,like a pack strap.
Geezer in Chief