thanks for the replies
was expecting a few more "i'll have a flake in mine please" type comments
i'd really prefer to use something i can put on the bike rather than a rucksack as i'll probably have to have a rucksack on as well to carry mutes / music / stand / etc....
most of the things i have seen would only hold my cornet if it were stood up on end (think small suitcase or thicker briefcase) and whilst notoverly heavy, it would be quite annoying to have it banging into my back if i had to brake hard.
it might end up that i'll have to use a large rucksack, but i'll hold that in reserve until all other options are exhausted
any further suggestions would be appreciated