"Excellent storage Bags" star star star star star_border Pump works well on bags if make sure sealed properly. Have been unable to get food box to vacuum as pump just seals itself over central button but does not extract air from box as instructions and video show. Must be doing something wrong. Would be even better if able to put bags in freezer. Mr Phillips - 03 February 2021 support_agent A note from the team Our buying team have said the unit will work the same for the box as it does for the bags. You just need to place it over the green spot on the box and press the button on top. Their only thought is either you're not holding the unit flush so the unit is not able to vacuum properly or the box the you have may be faulty - perhaps a valve isn’t working correctly. In which case we can either replace or refund.