Abstract: The present invention relates to shopping bags, bags, cases, envelops and similar (15, 40) for the packaging or transport of articles, made of a composite material comprising at least a first layer (11), at least a second layer (12), and at least a third layer (13) arranged between said first and second layer. The intermediate layer can have an aesthetic and/or shock-absorbing purpose. The shopping bag further exhibits a flat bottom that improves its capacity.