heavy bag for cardio

[duey]

thinking about getting a heavy bag to use for some extra cardio, and was wondering what size of one i would need,70,80, or 100lbs im 5 11 and 200lbs. what material does it need to be made of if hanging in my garage,

 

[AngryMuscles]

100 would be ideal. try to get a long bag so that you may kick too