Topeak Backloader Seat Post Mount Bag - 15L PLP|Model Year You can find them here

You can find them here

and a roll-style enclosure makes for easy loading and compresses gear tightly

Sold in pairs

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Topeak Backloader Seat Post Mount Bag - 15L PLP|Model Year You can find them hereLoad 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