Backpack

Backpack for frame. The openings in the front reflect the components inside for easy access.

Frame

Frame variations.
Screws could secure the tubing to the frame, this would make dis assembly passable.
I flat back would be needed for the bump bracket.

Tubing tidy

There will be a lot of excess tubing in between the feed bag and the pump. Some way of keeping it out of the way would be use full.

Frame

Frame made from two components. The two pieces of the frame could be mounted at varying heights depending on the length of the tube joining them. This would mean that a small and a large frame could be made from the same mould.
Smaller parts would also reduce moulding costs

Pump Adjustability

More exploration of pump adjust ability. A swivel securing would mean the pump could be mounted at almost any height.

Frame

A more aesthetically pleasing light weight frame. This would also be more suited to rotational moulding than a boxy design with a lot of flat surfaces.

frame

The frame must hold the feed and the pump. Perhaps it could be light weighted by removing the material behind the feed and the pump.