What do you think of either one?
I like the fact they're so rugged but at 4 and 5lbs empty, they seem awful heavy
I'm a very light packer so I don't need more than 2,000 cu. in. to live out of.
The Mystery Ranch looks a little more discreet and doesn't scream "If there is any doubt I'm high-speed, just take a look at how much velcro and pals webbing I'm pimping".
I've never owned either brand but you guys all speak super highly of them.
These are both fine packs. I don't have anything Kifaru, but a friend has three of their packs. Nothing negative to say about either brand, though I personally like my MR pack better than his Kifarus(he has a Pointman, but my Dragonslayer would be more comparable to the Marauder, size-wise).
I honestly don't understand the appeal of the 3DAP to civilians. It's heavier, yet smaller than the Dragonslayer, but has a radio cradle/harness(I like Grover6's idea of calling and having that left off), and the option of the BVS system for use with body armor. Unless you're deployed in a combat zone, that's just extra weight, useless features, and stuff to get in the way. The Dragonslayer is roomier, just a few inches taller, and weighs almost a pound less.
What do you mean by "light packer" and "to live out of"? Are you looking for a EDC daypack, or something compact for hiking?
For EDC, I'd definitely want something smaller than either of the MR packs, like the XRay. Actually been considering buying one, and would also like to see MR make a "1DAP" at ~1600-1700ci.
Like I said, the Dragonslayer is basically just a larger version of the 3DAP. I use it for hauling climbing gear, overnighters, and winter dayhikes where I want something larger than my lumbar pack. Wasn't part of the plan, but it's now my 3 day pack , too, since it worked great for 3 days of backpacking.
Check out my thread here for lots of pics:
http://www.bladeforums.com/forums/showthread.php?t=774843
I hate having extra crap on the outside of the pack, but the pouches I added to the waistbelt are convenient.
Need to update that thread again, since the Dragonslayer is back on their website after having its suspension beefed up.