Ortlieb Frame-pack Toptube 3L

"The Frame-pack Toptube 3L from Ortlieb is the ideal solution for cyclists and mountain bikers who want to transport their luggage safely and dryly without having to do without a water bottle. This practical frame bag offers a volume of 3 liters and is specially designed for use on the top tube, which means it can also be used on full suspension mountain bikes with limited space in the frame triangle. The waterproof 3-layer material and the waterproof zip ensure that your equipment is well protected even in the rain or when crossing rivers"
"The Frame-pack Toptube is perfect for stowing heavy equipment such as tent poles, tools or provisions close to the bike's center of gravity, which increases stability while riding. Mounting the bag is extremely easy: It is attached to the top- and seat tube with sturdy, strong Velcro fasteners and reliably withstands even demanding tours. Please note that the maximum load of 3 kg should not be exceeded in order to avoid material breakage. If necessary, use a scale to check the load."
"For a perfect fit, you can download a template of the outer contour, print it out and stick it together to determine the ideal size for your bike. The unisex bag is not only functional, but also a stylish companion for any bikepacking tour."