I just came across this post. For what it's worth, I priced tripod carriers and decided I wasn't going to pay that much money, but I didn't want to carry mine on my LowePro Slingshot. (Plus sometimes I can actually get the husband to carry the tripod!
So I cut the leg off an old pair of jeans, turned it inside out and sewed one end completely shut. The other end I folded the edge over and sewed a sort of "tube" around the edge, then ran a cord through it to make a drawstring. Pull it right-side out and sew on a couple of key rings, one at each end, so you can attach a spare camera strap.
Call me cheap, call me crazy, but it works.