Abstract: A large volume medical fluid vacuum collection canister includes a blow molded canister body defining a medical fluid receiving cavity. The canister body includes a pair of opposed upstanding sidewalls interconnected by a pair of opposed upstanding end walls a top wall with an opening and an opposed bottom wall. Each sidewall includes at least one reentrant beam portion extending inwardly from opposed sidewall surfaces into a central region of the medical fluid receiving cavity. The reentrant beams from opposing sidewalls are disposed in registering alignment so that there internal end faces abut in face to face relationship. The collection canister also includes a plurality of bellows recesses defined in the bottom wall and each of the opposed upstanding end walls. Each bellows recess extends the entire width of the bottom wall or end wall and further extends in a wrap around manner from the end wall or bottom wall portions to an intermediate point defined in the adjacent opposed sidewalls.