Abstract: A container system includes a container having a plurality of sidewalls and a rim extending from the sidewalls at a top of the container. The rim of the container includes a first sealing part and a second sealing part. Parts of the rim extend along arcs as viewed from above the container. The container system also includes a lid for sealing the container, with the lid having a rim that includes a first sealing part that is configured to contact the first sealing part of the rim of the container to form a first sealing area, and a second sealing part that is configured to contact the second sealing part of the rim of the container to form a second sealing area. Parts of the rim of the lid extend along arcs as viewed from above the lid. The container may be tightly sealed by the lid.

Abstract: A container system includes a container having a plurality of sidewalls and a rim extending from the sidewalls at a top of the container. The rim of the container includes a first sealing part and a second sealing part. Parts of the rim extend along arcs as viewed from above the container. The container system also includes a lid for sealing the container, with the lid having a rim that includes a first sealing part that is configured to contact the first sealing part of the rim of the container to form a first sealing area, and a second sealing part that is configured to contact the second sealing part of the rim of the container to form a second sealing area. Parts of the rim of the lid extend along arcs as viewed from above the lid. The container may be tightly sealed by the lid.

Abstract: A system of containers forming a group of two and three containers, where one and two smaller containers can be positioned on a lid of a larger container so as to prevent sliding motion of the smaller containers. Each of the smaller containers having a bottom wall of substantially the same dimensions with a portion of the bottom wall forming an upwardly extending indentation. The small containers are formed with upwardly opening walls and have lids releasably engageable with the bottom. The larger container lid having a flat upper surface which is sized to hold at least two of the smaller containers, and having structures to position one, and to position two smaller containers against sliding movement on said flat upper surface such that whether one container or two containers, the smaller containers are balanced about a central axis of the larger container and lid.