A container assembly for storing material for delivery to or from a printing machine, the assembly including a container having a chamber for storing the material and a first mouth member, the container releasably co-operable with a conduit device having a second mouth member projecting therefrom and a screw-on mating mechanism positioned on the second mouth member, the container including a plurality of bump-like projections adapted to lift the mating mechanism so as to easily permit the container to be inserted into or removed from the machine and easily permit the first mouth member to be in contiguous relation to second mouth member, whereby the screw-on mating mechanism is adapted to screw onto the first mouth member and secure the container to the device permitting the material to flow between the container and the device.