When in doubt, head to Lululemon for a bigger selection of gym bags that you could ever hope for in a variety of sizes, shapes, colours, and price points. Our highlight of the Lululemon City Adventurer Backpack (£98) is that it's so comfortable on your shoulders, thanks to the added reinforced strap structure. It's ideal for commuting if you like to head to work after your favourite class. Because of this, it is slightly smaller at 17L, but there is the addition of an expandable pocket to store your used kit inside. It's water repellent, too, so there won't be any nasty sweaty stains left behind.