Abstract: Containers comprise a container body and a cap, wherein the cap comprises a surface feature configured to accommodate engagement with a member to provide desired increased leverage to a user to aid loosening and/or removing the cap from the container. The surface feature may be an opening or any other surface feature, and the member may be another container having a cap or container body having a surface feature configured to complement and fit the surface feature of the cap, forming an interlocking attachment therewith. Both containers may be configured identically, each having surface features that complement one another, thereby forming a system made up of such two containers for loosening/removing the caps of one another. The caps each may include an opening and a section sized to fit in the opening so that the section of one cap fits in the opening of the other cap.

Abstract: Containers comprise a container body and a cap, wherein the cap comprises a surface feature configured to accommodate engagement with a member to provide desired increased leverage to a user to aid loosening and/or removing the cap from the container. The surface feature may be an opening or any other surface feature, and the member may be another container having a cap or container body having a surface feature configured to complement and fit the surface feature of the cap, forming an interlocking attachment therewith. Both containers may be configured identically, each having surface features that complement one another, thereby forming a system made up of such two containers for loosening/removing the caps of one another. The caps each may include an opening and a section sized to fit in the opening so that the section of one cap fits in the opening of the other cap.