A container comprising: a cap and a body; the body including a bottom and body walls extending from the bottom from proximal ends of the body walls to distal ends of the body walls; the body walls having a channel disposed within the body walls and proximate the distal ends of the body walls, the channel having a floor, an opening proximate the distal ends of the body walls, an inner wall including an upper inner rim disposed a first distance from the bottom of the body, and an outer wall including an upper outer rim disposed a second distance from the bottom of the body, wherein the channel is sized to receive a portion of the cap when the container is in a closed position, wherein the second distance is greater than the first distance relative to the bottom of the body, wherein each of the inner and outer walls extends smoothly from the floor of the channel to the opening of the channel without any disruptions, wherein the cap includes a top, cap walls, and a protruding end, the cap walls extending from the top, the protruding end extending from the cap walls in an opposite direction from the top to a remote end of the protruding end, wherein the cap includes one or more cap under-protrusions interior to the cap walls and extending from the top toward the body when in the closed position, characterized in that the protruding end has a cap inside chamfer proximate an inner lip of the remote end of the protruding end the protruding end being the portion of the cap received within the channel, wherein an exterior surface of the body walls and an exterior surface of the cap walls have a grip structure including a set of spaced apart aretes that run continuously and longitudinally along the exterior surfaces of the body and cap walls. a cap and a body; the body including a bottom and body walls extending from the bottom from proximal ends of the body walls to distal ends of the body walls; the body walls having a channel disposed within the body walls and proximate the distal ends of the body walls, the channel having a floor, an opening proximate the distal ends of the body walls, an inner wall including an upper inner rim disposed a first distance from the bottom of the body, and an outer wall including an upper outer rim disposed a second distance from the bottom of the body, a floor, an opening proximate the distal ends of the body walls, an inner wall including an upper inner rim disposed a first distance from the bottom of the body, and an outer wall including an upper outer rim disposed a second distance from the bottom of the body, wherein the channel is sized to receive a portion of the cap when the container is in a closed position, wherein the second distance is greater than the first distance relative to the bottom of the body, wherein each of the inner and outer walls extends smoothly from the floor of the channel to the opening of the channel without any disruptions, wherein the cap includes a top, cap walls, and a protruding end, the cap walls extending from the top, the protruding end extending from the cap walls in an opposite direction from the top to a remote end of the protruding end, wherein the cap includes one or more cap under-protrusions interior to the cap walls and extending from the top toward the body when in the closed position, characterized in that the protruding end has a cap inside chamfer proximate an inner lip of the remote end of the protruding end the protruding end being the portion of the cap received within the channel, wherein an exterior surface of the body walls and an exterior surface of the cap walls have a grip structure including a set of spaced apart aretes that run continuously and longitudinally along the exterior surfaces of the body and cap walls.