I think slingshot looks to be way to go
Check out Think Tank for awesome bags that are built like - well - tankshttp://www.thinktankphoto.com
I have literally thrown it from about 10-15ft up onto hard concrete
paul there were crumplers in tk max today 10 pound got myself a nice satchel
Crumpler produce is fine. Paid €160 for my laptop bag, which seems steep, yet has a 30 year warrantee (!)