HANDLEBAR BAGS
Bags of various sizes, shapes, and purposes can be attached to the handlebars. Probably the most classic representative is the Bar Roll or Bar Harness, suitable for sleeping bags, tents, and other equipment that can be packed into a cylindrical shape. A somewhat more versatile bag is the Bar Bag, which can be attached either separately or to both of the above-mentioned bags and can hold smaller items ranging from electronics to energy bars.
A more specific part of this category are bags for bottles, whether classic water bottles (Bike Bottle Bag), the equally popular "nalgene" (Fat Bottle Bag), or a bag for a flask (Flask Bag). With a little imagination, however, every user will find other uses for such bags.
Some bags in this category are waterproof, some are not. You can find this information in the details of each specific bag.