A first chair part may be fixed relative to a second chair part by way of a sliding member attached to the first part which slides in a body attached to the second chair part. The container can be stored in a flat condition but is capable of receiving a bulky item such as a loaf of bread or a stack of paper napkins with the bag assuming a squared off condition. Optionally, a siloxane modifier may be added to the resin system to improve the flexibility and impact resistance of the composite.