I was climbing with same model with a back pack on several years ago (no safety harness) and lost my grip on the upper part and basically fell backwards out of the stand. Luckily my feet stayed in the stirrups but it sure is no fun doing a set up with around 30 pounds strapped to your back. Needless to say I climb with a harness and that stand went by,by. I now use the viper that has the bar all the way around you.