A bag has two face panels having upper and lower transversely extending end edges and longitudinally extending side edges between outer ends of the end edges, two side gussets each between a respective one of the side edges of one of the face panel and the respective side edge of the other face panel, and a base panel having a peripheral edge connected to the lower edges of the face panels and gussets. The panels and gussets form beveled or rounded corners at upper ends of the side edges. Respective corner welds at the corners each extend inward from the respective side edges while leaving the face panels unconnected and forming a filling opening between the corner welds.