Free Sand Rail Designing Programs Free Standing Heavy Bag - What Kind Of Sand?

Free standing heavy bag - what kind of sand? - free sand rail designing programs

I have a freestanding punching bag, fill in those at the base with sand or water. (Water does not work well). I was told that Home Depot, a sort of sand-garden, which is capable of working well. I read the fine sand in the best?

Who knows what kind of sand would make better use, and where can I find? Thank you!