Hi I am looking to sell my purple Arc Blast backpack which I purchased new from ZPacks in 2015.  It is 60 liters total though I did add two more outside pouches, one on each upper side of the pack.  The pack has the patented ‘Arc frame’ system which Zpacks states transfers weight to your hips and provides a gap for airflow between your back and the pack. I do agree that the adjustable mesh frame does create a nice gap allowing for good airflow.  Add-ons at purchase were the adjustable torso height with load lifters and an interior key pouch.   I personally added two zippered hip belt pouches to the medium sized hip belt.  The weight of the pack is at or about 19.4 ounces.  The only damage to the pack occurred when I was initially installing the carbon fiber stays and punctured a hole mid height on the backside (see photo) which was easily repaired with DCF tape.

As a bonus I will throw in an unused Gossamer Gear sit pad!

I am asking $140 OBO plus $20 shipping (CONUS).

PM me with any questions.  Thanks, Chris