These are literally 'horn bags' (tsunobukuro). This a traditional bag style made from a single piece of folded and stitched fabric. The triangular 'horns' on the top can be tied in a similar way to a furoshiki wrapping cloth to create a handle. Because the material is on the bias the bag has quite a bit of stretch - though I'm not sure what these particular bags were used to carry. They have names on them so maybe they were for workmen to carry their personal belongings. They're made from hemp or a similar bast fibre and date from mid last century.