I wanted a Jam2. I got with an order with a Jam which was primarily my need but Golite's postage prices adds $1 to add the Peak to the order.
The Peak is worth the reduced price, but not higher price they called the MSRP. I use it as a daysack and traveling bag, used it this last week.
The hipbelt digs in but that might just be my manly beer curves :( the buckles at the front seem fitted wrong pressing inwards, so if you load is light to not need the hipbelt its fine. Comfy excluding the hipbelt and roomy for daysack, and I use on airlines as my only carry-on and pull out a 16L daysack of my in-flight gear needs, from inside the Peak's lidless open top helps with that and place the Peak anywhere overhead and the daysack under my seat. I hiked home from the airport 2 hours wearing the hipbelt, it helped keep the pack off my bag for cooling. The frameless design requires the pack to be FULL otherwise the hipbelt and loosening the shoulder straps to get the pack leaning off your back makes the pack concertina back onto your pack so you need enough contents to be stretching the pack into shape and I used the underside clips and the side compression straps to reduce the size of the pack to aid making it hold its shape.
This now gives me 4 sacks a 16L soft daysack I carry inside to use for small needs at destination, a 16L more rigid daysack Black Diamond Magnum, the 40L Peak and the 50L Jam.
Actual carrying camping gear, I plan on using the Jam, I found the 40L Peak a bit too tight when adding food and water and a bit of insulation clothing and the hipbelt is not as comfy when carrying loads for a long time, 50L Jam will be good enough I hope, I'm downsizing from a 70L framed pack when my tent was 2Kg, stove 1.5Kg, etc.