Also, a cool trick for the duct tape. I think I got this from Backwoods Magazine years ago.
As opposed to taking up all the extra space with the roll and core, chuck a 3 or 4 long inch nail into a drill press or hand drill. Put the end of the tape on it, square it up and hit the power switch. It will transfer your tape onto the nail and save a lot of space in your kit.
You won't be good at it the first time but after a little practice,....