Microwave popcorn popping bag

For popping popcorn in a microwave oven, a flexible bag is provided which contains popcorn and includes a collapsible stand. The bag has upper and lower opposing face panels connected together by longitudinally extending, centrally projecting gussets that are integral with the face panels. Prior to popping, the gussets are folded between the upper and lower face panels of the bag. The panels and gussets are preferably formed from a pair of superimposed sheets of paper that are laminated together with adhesive. Popcorn is placed in the bag and the bag ends are sealed. A microwave heating susceptor of any suitable type is provided in the lower panel of the bag or elsewhere in the bag if desired. During popping of the popcorn kernels, the bag increases in size and the gussets expand outwardly as the bag becomes filled with popped kernels, hot vapor and steam. To ensure that microwave energy will transfer well to the popcorn so that the popcorn pops efficiently, popping can be conducted with the stand folded flat, i.e., collapsed in certain ovens or, if desired, popping can be carried out with the stand erected so as to elevate the lower panel of the bag about 2 cm from the supporting surface of the microwave oven.