So I have been looking around at backpacks trying to decide what to get. I am guessing that most of my trips are going to be 2 - 3 days.

One of the things that I just haven't gotten much of a sense on, is how big of a pack I need (roughly). I don't want to go around with a suburban on my back, but I don't want to go too small either.

I have been looking at packs like this:
http://www.campmor.com/outdoor/gear/Product___88681

It seems to be a decent size (maybe even a bit on the big side) and looks to be an all around solid backpack. Thoughts?

That's a bigger pack than we use for a one-week trip, and it weighs an extra two pounds more than our pack. If it were me, I'd choose something lighter and just a bit smaller. WE make do with a 55 liter pack...and it weighs 3.6 pounds.

Which pack do you have? Or what would you recommend?

Standard reply-- purchase your gear and then go into an outfitters and find the pack that fits both you and your gear. What works for me and my gear probably won't for you and yours.

We could better assist you if you had a gear list with weights. Beyond that, we could name every pack under the sun.

FWIW I use Gossamer Gear's G4 for most of my trips.

And we use a couple of Eureka 3900s for almost all of our trips...

I think the pack you looked at seemed OK regarding size. It is not too big, and it could be used on longer trips too. IMHO you need more than one pack anyway, so a fairly big one will not be obsolete.

It all boils down to a question of comfort/money/terrain. You have not given any hints as to where you will hike, but as you know there will be difference in pack size from Alaska to sunny California. If you have much to spend on gear, you can obtain small expensive light stuff, otherwise you must have a bigger pack.

Me and my wife have 7 packs that are in constant use (and some old obsolete ones too). In litres we have 95,75,50,40,35,20,18, and it is not too much I think. For a short summit tour it is nice to have some warm clothes and a warm thermos in a small pack, and the biggest is in use on hikes with a week length. With rising age the demand for comfort is also bigger now, so there is no problem in filling the packs.

Today I went to a couple of shops and looked at (and tried on) several packs. The 55 Liter is quite a bit more roomy than I expected. I think it will be a good size pack for me to start off with.

Doing a bit of shopping I managed to find a High Peak Alpamayo 55 for 69.99 at Target (it's sold out now)

I also had a coupon for 20% off, and a gift card for $15. So I ended up paying about $40 out of pocket. Not too bad a deal I think.

Once I get it and use it, I will post on how much I like it.