A hydrocarbon adsorption trap for adsorption of hydrocarbon vapors includes a sheet-like hydrocarbon vapor adsorbent member having a hydrocarbon adsorptive media disposed between two or more media retention layers. The sheet-like member is inserted into an air permeable media support body including a first support member having a first set of locking members and a second support member having a second set of cooperatively configured locking members. The locking members are cooperatively aligned and configured to releaseably lock the first and second support members into a facing relationship with the hydrocarbon vapor adsorbent media arranged and retained therebetween. Mounting features are provided for mounting the hydrocarbon adsorption trap within the intake tract.