Ok, so recently I've been thinking on how to save on diapers when money starts to get tight, like right now. I am going black friday shopping ( actually starting at 8 tonite .) I know that using beach towels is not a good option and leads to major leakage. So my question is : What mixture of materials work the best? Eg: 80% cotton and 20% polyester or just 100% cotton or polyster ? Also with more bulk possible, would considering the next one to two sizes up in underwear(not boxers) help it stay up ?