The portable enclosure with an elastically sealed opening includes a base and a frame mounted thereon. The frame is formed from a pair of tensioned frame rods having central portions crossing one another. A fabric covering is secured to the frame to define a hollow enclosure. At least one substantially vertically extending opening is formed through the fabric covering. A lower end of the opening is positioned adjacent the base. Fabric sleeves are secured on opposite sides of the opening. An elastic loop extends through the sleeves around the opening. A tensioned rod is mounted on an upper end of the frame, one end thereof being positioned adjacent an upper end of the opening and supporting an upper end of the elastic loop. This support of the elastic loop creates elastic tension therein, which elastically seals the opening.