Pressing surface for filtration container assembly

A container assembly, the container assembly comprising:

• an outer container having a first open end and a second closed end and defining an inner cavity;
• and
• a plunging assembly having a first end and a second end, wherein the second end of the plunging assembly is configured to be received within the inner cavity of the outer container, wherein the first end of the plunging assembly includes a cap assembly having a body portion and a handle defining a holding portion, wherein the handle is configured to pivot between a first position and a second position such that, when the handle is in the first position, the first end of the plunging assembly defines a first pressing surface including a portion of the cap and having a first cross-sectional area, and when the handle is in the second position, the first end of the plunging assembly defines a second pressing surface including the portion of the cap and at least a portion of the handle, the second pressing surface having a second cross-sectional area, wherein the holding portion is spaced from the body portion in the second position such that a gap is defined between the holding portion and body portion, and wherein the first cross-sectional area is smaller than the second cross-sectional area.