Ive got a Big round bucket ( 50 L size ) that holds all my bits and bobs on my rear seat
Ive got a milk crate ( the type of 1 L plastic bottles, so taller and smaller footprint ) for my DRY scrims on my rear seat
Ive got a "IKEA" blue bag to hold my wet / dirty scrims, also on my rear seat
Thats it, my bucket sits between my WFP stuff in the estate boot
i then hang my bucket on a belt over my pole holder tube which goes from front to back over the passnger seat