Abstract: According to the present invention there is provided a flexible container for use by the end user as a cooking utensil. Said container comprises a front and rear panel formed of a food safe material and sealed at three sides, the rear panel being extended beyond the front panel on the unsealed fourth side to form a flap. On the upper side of the flap is formed an adhesive strip provided with a removable cover strip intended to be removed by the user when closing the container. The user is instructed to fold the container across both layers rather than simply across the junction of the flap and front panel in order to seal it prior to cooking. This creates a container which is effectively sealed but which is capable of releasing excess pressure above that level needed to steam the contents thoroughly.