Diaper pails with odor containment

A diaper pail, comprising:

• a body including an upper portion and a lower portion;
• a lid rotatably coupled to the upper portion of the body, wherein the lid is configured to rotate about a rotational axis to open to receive a diaper;
• a gate configured to slide horizontally within the body, wherein the gate, the lid, and the upper portion of the body define an upper chamber, and wherein the upper chamber is configured to contain the diaper when the lid is subsequently rotated closed about the rotational axis;
• and
• a door rotatably coupled to the lower portion of the body, wherein the door, the gate, and the lower portion of the body define a lower chamber located below the upper chamber, wherein the lower chamber is configured to house a garbage bag such that the garbage bag is to receive the diaper from the upper chamber when the gate is slid open, and wherein the door is configured to provide access to the garbage bag for replacement when the garbage bag is full.