Use this Babolat Club backpack for your tennis and gym equipment.
You will find a compartment that was specifically designed to acquire one racket (with shaft protection) and a primary compartment for many other belongings. There is a small hidden pocket in the back. Also, in the front, the big pocket will enable you to store diverse accessories.
The adjustable and padded straps are very practical and will enable you to transport the backpack on your back. Also, the small handle will allow you to carry the bag by hand.