Plastic wicker proofing basket with linen liner. Well constructed.  Readily washable.
We use them for 800-900g loaves. Dimensions : internal: 7.5cm depth, 30cm length, 11.5cm width. external:  9cm width across the base, 14 cm width across the top outside lip to outside lip. 32cm length across the top outside lip to lip. 8.5cm external depth. Also available in bulk.