What kind of base weight are you dealing with? And what price max is acceptable? There are a lot of options around, and a great many packs, even with suspensions, that are lighter and just all around better than a Jam 50. I'm a big fan of ULA packs. The Circuit is outstanding, and by removing the unnecessary parts you can drop 5+ ounces very easily. So for a 4ish ounce difference than a Jam 50 at 30 ounces (which is ABSURDLY heavy for a "frameless" pack), you could get an incredibly durable, beautiful backpack with possibly the best load support in its class and price range. About double the price of the Jam, but 10 times its superior in every other area. (Obviously I am heavily biased towards ULA, please do further research) :)
If you can fit your gear into it, the ULA Ohm 2.0 is a hands down winner for me. And at stock weight of 29 ounces, its already lighter than the Jam 50 even before removing all the extras.