Fit for purpose and then some.
Having ordered two 1500mm guide rails I was unsure as to whether this bag would accommodate both rails - it does. I already had a 1000mm guide rails and the bag also has a pocket on the front about 3/4 length of the full bag, which seems perfectly sized for the 1000mm rail. Having one bag for all 3 rails, allows for maximum flexibility, whilst protecting the rails during transport.