Compound feeds, whether in mash or pellet form, are packed in bags or stored in bins. Bags may be filled directly from mixers, pellet coolers or holding bins and weighed before sealing. Bags may be of jute, cotton, paper or plastic (HDPE) and can be hand or machine stitched or tied with a string. The BIS standard requires that the packing of balanced cattle feed should be done in clean and sound plain or polyethylene lined jute or laminated paper bags. However, normally the polyethylene bags are not used because of the risk of sweating and mould growth. Bags used for fertilizers, pesticides or other chemicals may also not be reused for filling animal feed.