2. Bracketing or matrix approach can be used for various container/closure combinations for the same or different products if process equivalence is scientifically justified. The matrix approach is acceptable for a range of product/container sizes. For example, the largest (longest time to fill) and smallest (fastest speed of filling machine) containers should be included in the APS protocol, together with an intermediate container size/filling speed if there are more than three product/ container sizes in the matrix.