In its preferred embodiment, the fast-erecting portable structure principally comprises two or more flexible framing rods and a flexible skin. The flexible framing rods essentially form inverted u-shapes and the flexible skin hangs from the flexible framing rods in substantially a dome shape. More specifically, the flexible skin can be supported from the flexible framing rods by sleeves sewn into the flexible skin. The sleeves allow the flexible skin to slide along the length of the flexible framing rods. The flexible skin is also fixed (or non-removably) connected to the ends of the flexible framing rods. The fast-erecting portable structure can be stored by coiling the flexible framing rods into a storage bag. The fast-erecting portable structure allows the structure to be immediately erected from the coiled position in the storage bag into the structure without any intermediate steps or the addition or removal of any parts.