Don't wipe it off

Durable and water resistant

Material: 304 stainless steel tubing

the F10 is a perfect choice

this is your solution

Topeak Backloader Seat Post Mount Bag - 10L Do Not Ship Internationally Don't wipe it offLoad up and go ride! The Backloader is designed for those of you who want the extra space for long adventures. With a max load of 5 kg, the Backloader utilises straps specifically engineered for heavier loads. Includes a waterproof inner bag to ensure your gear will always stay dry! Fitting easily and neatly onto the seat post and saddle rails, the waterproof inner bag will enable you to keep the contents completely dry and its built in air release