Those are heavy, I would just get a Carradice rear bag (maybe a lowsaddle model) possibly with a coroplast liner for structure. You get two side pockets and and a flap that opens whichever direction you decide works best. Attachment to the front wouldn't take much fiddling.
Those are heavy, I would just get a Carradice rear bag (maybe a lowsaddle model) possibly with a coroplast liner for structure. You get two side pockets and and a flap that opens whichever direction you decide works best. Attachment to the front wouldn't take much fiddling.