A modular biological processing cartridge and container

A modular container 200 for biological processing arranged to be retained, in use, within a slot in a biological processing cartridge, the container comprising a bottom housing 250 comprising an internal cavity, a top housing 220 attached to the bottom housing with a fluid opening 240 to provide a fluid connection from the top housing to the cavity of the bottom housing and one or more engagement 230, 231, 232 components configured to releasably retain the container within the slot. The engagement components maybe a rear wall for abutting against a frame of the cartridge when fully inserted into the cartridge slot, a front edge 231 to engage with a snap fit connector of the cartridge or grooves 232 to engage with guide rails of the cartridge. The top housing may be connected to the bottom housing by welding or a push fit connection. The opening may connect with a fluid conduit positioned inside the bottom housing.