Microwave oven with disposable liner bag

In a microwave oven including a cabinet having walls defining a generally rectangular cooking chamber with a front opening, a door supported by said cabinet for movement between a closed position covering said opening and an open position providing access to said chamber, and means for producing microwave energy within said chamber when said door is in said closed position, the improvement comprising a disposable liner bag for said chamber, said liner bag being formed of a liquid absorbing and fire retardant paper material, said liner bag having fold lines for collapsing said bag between a generally flat collapsed position and an erected box-like open position, said liner bag being generally the same size as said chamber when said liner bag is in said open position and having means defining an opening adjacent said door, and patches of pressure sensitive adhesive on the outer surface of said liner bag for releasably attaching said liner bag in said open position to said walls defining said oven chamber.