I've had the Haversack Depradador from Comandos De Selva
http://www.comandosdeselva.com.co/ for about 6 or 7 years now and it's as good or better than anything I've found made here in the states. I paid about US$75 for it plus shipping of about $25. Great quality. I've never busted a seam, buckle or zipper and the ability to unzip the outer pack and turn the bottom half into a three day pack (that actually holds as much as an Alice Large) has been invaluable. Oh, and did I mention that one of the outer sections has a velcro holster and magazine straps at the top where you can get to it quickly if needed?
I use this as my primary luggage now. If you can go up to $100 you wouldn't be sorry. It's gone through everything in the civilian world plus two deployments with me and is still going strong.