An electronics circuit card system includes a flexible elongated hollow receptacle; a working fluid disposed within the flexible elongated hollow receptacle; one or more wicking structures formed within an interior hollow region of the flexible elongated hollow receptacle, wherein the one or more wicking structures are configured to circulate the working fluid within the flexible elongated hollow receptacle and expand the flexible elongated hollow receptacle against an electronics circuit card; and a chassis configured to hold the flexible elongated hollow receptacle against the electronics circuit card.