I use a 100 pound bag but it's soft...the 75 pounders we have at my gym are hard and when I hit those I don't usually put everything into my shots, I try to hit with form and speed. With the 100 pound bag I can hammer it all day with wraps and gloves and I'm fine...hitting the hard bag makes my hands hurt less when I spar, I guess by comparison a face is softer than all that sand or buckwheat or whatever in the hard ass bags at my gym