Yo im love with this bag. I was trying to be patient to receive them and I was. After unpacking it took approximately 10 minutes to put this unit together; super simple assembly there are no nuts, bolts, screws and no tools needed! YOU CANNOT USE THE CHARGING BRICK THAY COMES WITH THE IPHONE 11 PRO MAX. Will be ordering more in the near future. I land better when I am jumping around, as I seemed to be landing on my toes with other trainers. One for son and one for daughter. Follow manufacturer instructions. A pair of shoes that costs this much should last much longer. I bought this to use on my bike but after hours of trying to take my bike apart, I tried my husbands bike.