The two green base plates that serve as the covers, can be removed and used as building bases. This has been used but is still in great shape with
ECOFANTASY Kids Travel Tray - Waterproof Carseat Table
Legos Tray - UK
1994 Building & Storage Lap Tray with Bins. LEGO -- YELLOW LAP TRAY --- with 2 GREEN BASE PLATES. This tray is in great condition with normal play
LEGO 1994 VINTAGE Lap Tray Table Building & Storage Bins w/ Fold up Legs PLATES
Art Lap Desk Storage
Some wear. One small hole in the blue tray as seen in photos. Over all nice shape!
Vintage Lego Lap Table Storage Tray Travel Carry Case 1998 Purple Rare 20”x12”
Adjustable Lego-Compatible Storage Container with Lego Building
LEGO Vintage Blue Storage Carry Case Building Green Base Plates
LEGO VINTAGE LAP Desk Storage Carry Case Travel Tray Table Building Base Plates £46.10 - PicClick UK
1998 LEGO LAP Desk Tray Travel Table Carry Case Storage Red Green Base Plates $18.50 - PicClick
Some wear. One small hole in the blue tray as seen in photos. Over all nice shape!
Vintage Lego Lap Table Storage Tray Travel Carry Case 1998 Purple Rare 20”x12”