A food storage unit provides a container and a cover which use an interference fit to snap the cover onto the container. The two engage with each other by a first lip (of the container) and a second lip (of the cover). The lips are configured to have an obtuse angle of 95 degrees, helping to create a better fit between the two. The second lip deforms when placed over the first lip; the resulting pressure and friction helps to seal the cover to the container. To help create a more secure attachment, a latching member is connected to the second lip. The latching member is positioned just below the first lip, such that the cover cannot be lifted straight up until a person manually moves the latching member away from the first lip. This helps prevent the cover from accidentally coming loose from the container.