These special backpacks come with a hydration system. Like the other bike backpacks, they have a practical pocket layout to keep tools, rain jacket and co. well sorted and quickly accessible. Many models also have the option of attaching helmets or protectors for long rides. As a rule, dedicated drinking backpacks are somewhat smaller and more minimalist, as their main task is to provide optimal fluid supply while you're out riding. It's important to ensure that the smaller and lighter models also fit securely and included chest strap is particularly handy for this. When choosing the right model, the rule is to buy as much backpack and water reservoir volume as necessary. If you buy too big, you'll have to carry more weight and size when riding. You'll usually have many opportunities to fill the drinking bladder when out riding.