With Alexander Zverev urging everyone to "take greater care of the planet", HEAD has collaborated with him to create its first tennis bag made with recycled PET bottles. Slightly smaller than the GRAVITY R-PET DUFFLE BAG, the GRAVITY R-PET SPORT BAG has adjustable dividers that attach to the clothes-friendly velcro straps inside. There is space for up to six racquets, an integrated shoe bag, and a number of inside and outside accessory pockets for all your belongings. With its adjustable backpack straps, the SUSTAINABLE GRAVITY SPORTS BAG is a highly functional bag.