Greetings, I am wonderign with what you guys fill up your punching bgs and how much do they weigh. 4ft , 5ft , 6ft ? Sand and saw dust was used way back, what do people use nowadays. I had some bags filled with chunks of leather and a 4 ft bag made out of artificial leather wighed 40-45kg whils the 5 ft weighed up to 65 kilos. Is that to much ? Please share youre experiences. Sincerely, Cobosan