A system and method for pumping fluid using a set of interconnected pump cassettes is disclosed. Each of the pump cassettes can receive a first solution in a first pumping chamber and each of the pump cassettes can receive separate second solutions in respective second pumping chambers, so that the first solution can be mixed with the separate second solutions, each said mixture capable of being placed in separate containers. The system includes a control assembly for operating each pump cassette, each pump cassette having a flexible membrane to pump fluid into and out of the pumping chambers, and each pump cassette configured for mating with a base unit that provides positive or negative pneumatic pressure to the flexible membrane.

A novel proposition is herein presented for providing a safe and user-friendly door especially for logistics containers. The door includes a quadrilateral frame, which defining the perimeter for the door. A latch is provided movably to the frame so as to be manipulated between a locking state, in which at least a distal portion of the latch protrudes outside said perimeter, and a released state, in which the distal portion is flush with or inside said perimeter. The frame also includes a diagonal guide, which is configured to guide the latch between the locking state and the released state by allowing deviation of the latch along a path diagonal to the quadrilateral shape of the frame.

A system and method for pumping fluid using a pump cassette is disclosed. The system includes a control assembly for operating the pump cassette. A force assembly having a movable member is capable of applying force to the pump cassette to press the pump cassette against the control assembly. The movable member may be an expandable member, such as a bladder.