Juststrong Jet Black Backpack If you love a classic black backpack, then you'll want to head to the gym with Juststrong's Jet Black Backpack (£25). This bag can store up to 18L of gym kit with some reviewers mentioning that there is enough room to fit a netball inside. The padded back panel makes long walks feel like a breeze. You might want to add a separate zipper wallet inside for any small pieces of jewellery, though. Image Source: juststrong.com Juststrong's Jet Black Backpack £25 from juststrong.com Buy Now