Abstract: A collapsible trap for crabs and crustaceans is disclosed having a flexible upper ring and a rigid lower ring covered with a net material forming an interior chamber. The flexible upper ring is made of flexible, yet memory retaining materials, that resist deformation in normal use in its open state, and are corrosion-resistant, wear-resistant, particularly to repeated flexing without cracking, in the presence of harsh marine environment. The collapsible trap is capable of assuming a normally open state for use, and a partially and completely collapsed states by manually twisting and coiling the flexible upper ring onto itself in one or more smaller rings until the upper ring is the same size as the rigid lower ring. In the collapsed position, the collapsible trap takes up much less space than in the open position, thereby allowing ease of transportation and storage when carried and stored in a bucket, bag, or a small compartment of a boat or a car.