I have read that a standard sized basketball filled with sand will end up at about 25 pounds.
Do you know how big of a weight difference there would be for pea gravel, dirt, water, rice, etc.?
Anyone with experience making their own?
Trying to have a set for a 7th-8th grade co-ed XC team. Thinking something less than 25 pounds would be more beneficial. I like the size of the basketball though.