Abstract: A frame for holding and arranging a static mixing device along with flexible containers for liquid substrates, waste, and a liquid product. The frame includes sealable regions for holding the containers and the flexible containers and the mixing device. Other aspects relate to kits including the frame together with one or more matching components, such as the static mixing device and the flexible containers; as well as apparatus for operating the frame in its assembled state, and methods including the use of the frame.

Abstract: Described is a seat back comprising a curved rear wall bordered by a perimeter wall projecting forward from the rear wall. The curved rear wall and perimeter wall define a cavity in front of the rear wall and between opposing surfaces of the perimeter wall. The seat back comprises an upper part and a lower part. The lower part comprises a surface of the rear wall which is curved forward toward each side wall of the lower part and curved forward toward the base of the lower part. The width of the seat back tapers from a first width towards a second width at the base of the seat back.