5 but the 8 fits perfectly! Have been using it in conjunction with a double kayak rack. I can machine a straight slot in wood or whatever and put the hold-down screws in a straight line and hopefully make this aluminum extrusion straight. I was able to carry everything I needed without feeling weighed down. They fit very well! This equipment takes up some floor space, costs a little more, and ultimately I think theres still a limited amount of exercises that can be done on it that could be substituted elsewhere. ★BATTERY: 25 hours. Just received my ChaChas and I love em. Cons: A bit pricey compared to other eco-friendly bags. So this provided the extra space I needed!