Screw Top Bag Clip

Model name pretty much says it all. A bag clip with a screw top for pouring (looking at you cereal, rice, etc). Bag gets sandwiched between the inner ring and the arms, cap screws to the outside of the arms. Pin and nut included for the hinge, but it's sized for an m6 if you have a spare bolt sitting around. 

Multiple lengths of arms included

Arms will need supports under the hinge areas and clip overhangs.