I picked up an Out-In-The-Field grab bag from Kit Monster Paracord (via their Facebook page) the other day and have been very impressed with it, especially for the money as it was only £28 including P&P!
Its got loads of pockets which all zip up, the main compartment is roomy and easily holds binos, rangefinders and what-not (I also got 150 12g cartridges in it going clay shooting with some room to spare) plus it has a draw tie on top to keep water out and the main strap has a padded shoulder strap so its comfy to carry for long periods of time. I also like the little patches on the back as they seem to stop it slipping around on your clothing.
I've loaded mine up with all the various things I take stalking (bar rifle and ammo) so in the morning all I have to do is grab that bag, the bandookie and ammo.
Worth a look if anyone is in the market for a new kit bag thats not too large but still has enough storage for everything you need.