Just a heads-up for anyone interested in cutting their own rolls of paper: AG Photographic in the UK sell light-safe bags for storing paper. The site says these are the same ones used by Ilford and are completely light safe. They measure roughly 12.5" x 19.5".
http://www.ag-photographic.co.uk/light-proof-black-bags-505-c.asp
http://www.ag-photographic.co.uk/light-proof-black-bags-505-c.asp