You mean saw that in my kit :rolleyes: Hey Chris! Hey Tom! It works great, here's a link for the tubes I use (http://tinyurl.com/2xh8t7).
What I do is buy the full size 1-1/2" x 15" ones in a pack of 12 from Staples (if you order online it's cheaper and you don't get Staples' stickers on them like in the store). For smaller 12"x12" gels I take a blade and cut the tubes exactly in half. They come with caps which fit onto the tops/bottoms. After cutting them in half I have 2 tubes to fit 2 gels into, caps at the bottom. If I'm using full-size sheets, I simply don't cut the tube in half and use it full size at 15". You can fit roughly 75 gels in a milkcrate this way.
I also take two coffee cans (http://tinyurl.com/24k76o) and fit them into the crate full if C47's. All of my CC gels are labeled by 1/4, 1/2, FULL, etc. in one corner (not needed for stuff like white diffusion that I know is 250 or 216, etc.) so that I can tell a newbie grip to go to my case and grab me 1/4 CTB. They can easily find it based on the labeling.
And like Tom said, it keeps you organized up-to-date with your inventory.