Both are great and I don't think you can really go wrong with either. I chose the ULA Circuit because I felt that it rode a little better.
You gotta remember that those compression stuff sacks can add up to some weight too. A Catalyst is a good pack for 4 seasons as you need the increased CI capacity for increased bulky items and increased caloric requirements in cold weather. ALSO if you are hiking with another person like a spouse and you have increased weights and space requirements due to bulkier shared gear YOU have to carry the extra space is a blessing. As well for the summer, yes you will have a lot of excess capacity for places where resupply is a weekly gig like on the AT, but the good thing about the Catalyst is that the top can roll down and the pack shrinks down very well. If your resupply points is further apart then the increased CI is welcome to carry the extra food needed. Not saying you could not do it in a Circuit, but you have the room in a Catalyst when needed. On the AT its nice especially in the Spring/Fall.
I haven't read all the entries, but for me it's a nobrainer to go with ULA! I only used Golite on my 2005 hike and had to change packs in Erwin because I was getting pinched nerves on my shoulders. Since then I have purchased three ULAs (Catalyst, Circuit, and CDT) and love them all! I mostly use the Circuit now that I have gone lighter. The CDT is great for shorter summer hikes.
I have both and hands down the ula circuit is well worth the extra $$$$!!!!!
I used a the 2nd model of the jam on my thru attempt this year, and found it to be too heavy for what it was. a frameless sack with shoulder straps doesnt need to be anywhere NEAR 2 pounds.
BUT....it held up fine and worked as advertized, not a bad pack, you just can get more for the weight elsewhere.
I've seen more spine in jellyfish
Can anyone give some insight/recommendation as far as the ULA J-strap vs. S-strap goes?
I own a ULA catalyst and a Go Lite Dawn. I almost always use the Go LIte dawn now, its 13 oz and it took some effort to get it. ULA is only for long trips out west where water is scarce and ressupply is scarce
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i use go-lite jam, am a section hiker, 1 to 4 weeks at a time. once i learned how to load the jam, i found it worked for me. it also taught me how to carry under 30 lbs., the pack is limited in how much weight to carry. i can carry for up to 6 days, then need to resupply.
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I recently got the GoLite Jam 70 for my thru hike, I have only taken it on a few short hikes so far but it seems really nice. Never hiked with a frame-less pack though so it'll be an experience!
I was thinking of getting the new Gorilla 2012 Ultralight Backpack. How does that compare?
http://gossamergear.com/packs/backpa...-backpack.html