A purse having interchangeable inner bags includes an outer casing, a plurality of inner bags, and a shoulder strap. Arranged underneath the polymer film is an absorber layer which has an absorber dye. The heat release layer is thermally and electrically connected to the heat release member. These methods can greatly increase the rate of flotation for the particles that are usually difficult to float, such as ultrafine particles, coarse particles, middlings, and the particles that do not readily float in the water containing large amounts of ions derived from the particles.