Meet the StrikeMMAsk trainer: a handy tool that straps around any boxing bag to let you work on your punches and kicks. It comes with velcro straps to fit around your bag and stay put as you exercise. You can also take it aside and use it around a tree to train.
The StrikeMMAsk lets you perform uppercuts, left & right hooks, jabs, throws, and even ground & pound. Available for $60.