Hoover Reference

Images of the Hoover I took, quite a simple object to model, which I'll approach separately and parent together at the rigging stages. 

Finished Geometry

This is the final model I will be rigging. At this point in time i'd like to add some sort of control to the bag that will allow it to translate around and squash and stretch. I already used a Spline IK in the Toxic Boy Rig, which had its issues with the stretch. Because the joints had a multiply on the scale X, the top joint expanded with the rest causing uncontrollable bulges around the base of the neck.

The ribbon spine doesn't have this issue, because it uses the uv position of the joints in relation to a nurbs patch to interpolate its position so there is no multiplication on the scale. This makes it a really nice robust setup, and as long as there are holding joints above and beneath, it will deform nicely.

The other challenge i have with this rig is to ensure the wheels rotate as the hoover translates. I'll be using an expression to drive this.

Side View