Here's a couple of thoughts to help save space, provide some multi-function to your kit.
Batteries. Get gear that works with AA's and go with ONE battery size for everything. Watch batteries, 9v...unless needed, ditch them.
Headlamp. Because it sucks trying to tie a knot in the dark with a flashlight in one hand.
Cheap version of Sham-Wow from the dollar tree. Works great as camp towel.
Coffee Filters....a zillion uses. Get some, read up, have fun.
Twine. A ball/roll of twine saves your paracord for bigger-better stuff that you'll need it for. Cordage is ALWAYS good. Twine is tough and light.
Rope Rope...like rappelling rope, but you don't need the expensive stuff...just get 50 to 75' of the $10 stuff at walmart. It'll work in a pinch to get you out of a tight spot (or Timmy from the well).
E-tool/folding shovel. Handy.
Sierra Saw/Folding saw....best $10 you can haul into the field. Cuts through wood, bone, and rope like a hot knife through butter. Dig It. Forget the survival/wire saw junk...get one of these.
Try to figure a way to use your blow guns as something else, too...like tent poles or combine them to make a hiking staff....
Dr. Bonner's peppermint soap. Cleans you, your clothes, your gear, your mess kit. Good stuff.
2qt military style canteen does double duty as a pillow.
Survival knife. There are 8 billion choices...lemme help narrow it down. Full tang is a MUST. 3 of the most proven - USAF Pilot Survival Knife, USMC K-bar, Gerber LMFII (which has replaced the older USAF Pilot Survival Knife). Those three are excellent choices.
Food Food Food. Stuff like Ramen noodles won't smell up your pack if it explodes.
Waterproof Knot Card(s).it helps to have a card handy because knots are like foreign language...if you don't use one for a while, you forget it. There are so many good knots out there to be learned only to be forgotten 3 weeks later. haha.
Read Read Read, Practice Practice Practice. Knowledge is good but application is great.