The Canon Case 400B is a well engineered hard case, designed specifically to protect the Canon EF400 f4.0 DO IS USM lens.
Price: £439.99 from Wex Photographic
The Canon LP 1019 Case is a soft lens pouch designed to protect the Canon For E75 300 f5.6 USM III, EF75 300 f4.0 USM III, EF100 300 f4.5 USM and EF S 55 250 f4 5.6 IS lenses from dust and dirt.
The Canon LP 1319 Case is a soft lens pouch designed to protect the Canon EF16 35 f2.8L II USM, EF17 40 f4.0L USM and TS E 24 f3.5L II lenses from dust and dirt.
The Canon LP 1224 Case is a soft lens pouch designed to protect the Canon EF70 200mm f4.0L USM lens from dust and dirt.
