Here on the East Coast; especially in Northern Virginia, etc. discretion is needed with all the insecure pseudo-environmentalist, antigun, effeminate, city slickers in the woods. I walk well away from the trails but sometimes have to cross them and have to get into the "wilderness" areas from the same parking lot they park in.
I came up with a method I like for secure, discreet, fast draw carry. I use one of the fine Eagle Creek shoulder bags with the strap fully extended and under my hip belt and shoulder straps of my pack. For instance the wanderer model:
http://www.eaglecreek.com/day_travelers/60021.html
Whenever I take my pack off the shoulder bag is still with me and the reach in back pocket is fast to get into. I keep some other necessaries in the bag too. When it is strapped down under my waist belt it hangs like a tactical holster/bag. The Eagle Creek shoulder bags all have reach-in back pockets that are perfect for quick access. I fashioned a piece of flexible flat plastic sheeting to fit the pocket and onto it I glued a cut down holster and three magazine loops for my Makarov and three extra magazines. It keeps my Makarov just where I want it, invisible and quick to get.
The bag is quite pleasant to wear with or without the back pack and can go with me anywhere; on or off the trail -- day or night; when I'm out in the Politically Correct Northern Virginia "wilderness" parks.
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Talk is cheap; Free Speech is NOT.
[Edited to fix link format.]
[This message has been edited by Mal H (edited July 14, 2000).]