Ortlieb Toptube-bag

"The Toptube-Bag from Ortlieb is the ideal solution for anyone who needs quick access to important items during the ride. With a volume of 1.5 liters, it offers enough space for snacks, smartphones or other small items of equipment. The magnetic lid closure makes it easy to open and close single-handedly, so that you can concentrate fully on the juice. Thanks to the innovative Tube-Lock system, the bag can be easily attached to the top tube and removed just as quickly if required. The system can be mounted directly on the threaded holes on the top tube or alternatively with the rubberized perforated straps if no holes are available."
"The Toptube-Bag scores with practical features such as a silicone cell phone holder that is suitable for various smartphone sizes and an integrated cable outlet that allows you to charge your devices while riding. The robust nylon fabric with PUcoating ensures waterproofness and durability, while the mesh inner pocket inside ensures easy organization of the equipment. Note the maximum load of 1 kg to avoid the risk of material breakage and the associated risk of injury. In addition, the distance between the bag and stem should be at least 10 mm so as not to interfere with the steering."