Originally Posted by
colorado_rob
Don't be lured into buying/carrying a huge pack by the "car camping" crowd (those that don't hike very many actual miles, but camp a lot and carry huge tents, overly conservative bags, tons of extraneous clothes, axes, big knives, extensive cooking gear, etc). I betcha your 50+10 will work. I firmly believe that even for those that carry a few extra items, the "average" backpacker, for late-spring through early-fall, no long distance hiker needs more than 50-ish liters (assuming they have, say, some nice outside pockets, maybe what you're calling "+10").
Agree, a bit of compression (even a lot, according to some) does nothing to hurt a down bag. STILL, I err on the side of caution as I too have several very expensive bags (including a WM $700 bag and a $500 Katabatic gear quilt, and several others), so I would never use an actual compression sack (the ones with the tightening straps). But I do choose the smallest sack that I can barely stuff my various bags into, or many times, just stuff into the bottom of the pack and let stuff on top press down.