I have used these for years and they are still in great shape...
Take a pair of old jeans and cut the legs off (with no holes), Sew one end of each together (if you want two bags), now cut them to the length you want, fill with cat litter, sew the end closed, throw on the ground several times (this gets some of the litter dust out) And you are finished. They work great and last forever (as long as you don't leave them in the rain \:\) )
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If some people could read my mind, I'd get punched in the face a lot!
Women have cleaner minds than men, they change theirs all the time!