To use: soak the retainer for 15 minutes, dry and then fix to the underside of the POP container lid. Re-soak as needed to keep things fresh. Do not wash with soap. Recommended for use with 1.1 Qt / 1.0 L POP container with 0.5 kg brown sugar and 1.7 Qt / 1.6 L POP container with 1 kg brown sugar; also fits POP containers with lids: A, B, C, D, E.