Ortlieb's Topetube frame package is designed for riders who want to use the storage space in the main triangle of the frame without sacrificing water bottle placement. It is suitable for full suspension mountain bikes with limited triangular space as well as for road and gravel bikes which have enough space under the top tube. 4 liter payload means that we can accommodate everything from tents to water containers and its location provides a lower center of gravity for even weight distribution while riding.