Though this is somewhat modern,,,

[BIG-TARGET]

This is, from personal experience, a good quality bag to own/use.
Take a look at Milspec Monkey's review!!
http://www.youtube.com/watch?v=So5iQoQQswg

 

[Humpback]

I have one of these and can get my dayout stuff in it. There's also a review from a member here, take a look:

http://www.bushcraftuk.com/reviews/carrying-stuff/maxpedition-jumbo-versipack-review.html

There is an airsoft shop at Cannock, West Midlands which sells almost all Maxpedition gear called 6mil but their web site is down at the moment:

http://www.6mil.co.uk/

regards
Alan