I also make many of my leaders. I put together my own Maxima leader kit and keep it in a big zip lock bag in one of the pockets of my large tackle bag.
I use a program called "LeaderCalc" made by Steve Schweitzer. It's easy to use; just put in your selections for leader type, length, tippet size, and fly line weight.
It outputs a formula for each size of mono to tie up to make the leader. It also has a place where you can print out a label with the specs for that leader. I bought 1000 small zip lock bags off of eBay a long time ago. I put the leader and the label for that leader in a zip lock bag and put all of the leaders in a leader pocket in the front of my tackle bag.

It's all very easy and simple to use. I always have a fresh leader when I want one. I used to hate tying blood knots but after a bit of practice and the right technique, they are no longer an issue.

Brian