An implant includes a first container and a plurality of members disposed in the first container. The implant can be made by attaching a member to a second container disposed in the first container and inserting the second container in the first container. The implant can be used by disposing the implant into a subject and adjusting a volume of a fluid in the implant. Additionally, a tissue expander includes an outer container； and an inner container disposed in the outer container and comprising: a reticulated frame comprising a plurality of struts which interconnect； a void disposed between the struts in the reticulated frame； and a projection connected to the struts to cover the void.
