Bob Xl Vancouver How Much Sand Should I By To Fill The Base Of Punching Bag "Bob" XL?

How Much sand should I by to fill the base of Punching Bag "Bob" XL? - bob xl vancouver

I bought Century Bob XL W / perforation in the groin area, which is a big, life as a punching "backpack" type of element in boxing and martial arts, which are used alone. I do not know how the sand, which to buy it to fill the base. I would like more frequent enough point, but I will not get stuck with a pile of sand. This is not a new unit, so I do not think that they come with instructions. Any tips on how to buy a lot of sand if you do not want to use water?