It won't go along the length either - I have tried that (was trying to work out how to transport a pilates mat on a bike....)
Using normal panniers will keep the centre of gravity lower than putting something on top of the rack.
If you are not likely to ever want to consider touring then the messenger bags may be OK, but I came from a touring background and there the roller back classics really are the best you can get. You can also purchase them in singles as well and last time I checked, if you did not mind the colour you could pick up one for
£45 I think it was...[/quote]
I thought I might be able to get the small rack pack lengthways (i.e. front to rear) on the rack ? The overhang might only be about 10cm, do think would work ? What happened when you tried it ?