I use this Jan Sport in grey:
Large enough to hold enough to bug out a few days and discreet.. does not look like a military bag. Plus I got it on sale for $15
Me and my family used AIM surplus. For a extra $10 you get a hand picked best of 5. The Mosins I received were in excellent condition.
http://www.aimsurplus.com/product.aspx?item=F3MOSIN9130