Backpacks and shoulder bags come in countless models from Louis. You will find everything from the no-frills messenger bag through to the aerodynamically designed backpack or the stylish shoulder bag for strolling through the city. When buying a backpack, you should also consider whether you need it to be waterproof. It may be a good idea to order a rain cover at the same time. Tip: You should avoid carrying hard or sharp-edged items in your backpack, as they could cause injury in the event of an accident.