Oh, yeah, I think once you're over 35lb, you need a pack with genuine, structural stability and the capacity to keep the weight on your suspension system, rather than your spine. I've been in your situation many times, and still will be in the future (at least in terms of weight), and I also use a Kelty. My Kelty's a bit older, but I'm cheap...

Now, I would suggest this: spend time and effort to lighten your components, carried gear and to take a very keen eye to the project. That's what brought me here: my mega load and the load of youths I need to keep truly light. You WILL find ways and "locations" in your gear list if you read in the "Multiple Use Gear" forum, this Gear forum and the General Backpacking forum, and this won't necessarily mean you have to spend a mint or reduce your sleeping pads to 3mm vapor lace (or whatever the masochists have come up with lately).

Someone above said something to the effect that, once you're over 40 lb, what's a few more? Ha Ha, well, the answer is, "what it is, is WAY more". Do not take that attitude, at the peril of your back, your fun and your enjoyment. Remember, if you lighten your systems now, they'll only get lighter as the kids grow (in your case, several years) and start to carry a portion of what you have in the pack, now.

Ironically, it's the opposite: if you're only carrying 20lb, another ounce for a better knife or stove is freaking nothing other than digits on a spreadsheet.

Somebody else mentioned 70 pounds above! Aside from mirth at the prospect of how many particular readers here undoubtedly shrieked in horror at even the sight of such a number, I recoiled in the pain of "little brotherhood": I've carried 60 --far, far less than 70-- many times and it just plain sucks. Sure, I remember the 1970's and 1980's machismo of "heavier back, further back" and I still marvel at a dude we used to meet deep in the Sespe with a 10" cast iron skillet we'd cook bacon on, but times change and frankly, that was dumb then, too. Dear 70lb packer: you owe it to yourself to shave weight and you easily can -- my full 60 rig is down to 49 and I've added a second bear canister. Of course, I'm also working hard to avoid needing the 49 and will be much happier with 45... 70? Crazy Train.

Mystery Ranch Trance xxx so you can get all your family stuff in it will carry 40 lbs plus.Or if by your self Mystery Ranch Big sky a 50 liter pack. If you need to carry 100 lbs. plus the Get a Mystery ranch Nice frame paired with a pack. Mystery Ranch is the designed and owned by Dana Gleason of Dana design They have recreation line they also have Hunting,Military,Hot shot line for fireman. Because they need to carry packs that are bomb proof and will carry a really heavy load easily. Also made in the USA in Bozeman ,Montana.

http://www.mysteryranch.com/recreation

Terry

The Kifaru KU5200 is an 85L pack that weighs 2 lb, 13 oz and is rated to comfortably carry 100 lb.

There's also a KU3700 60L pack that weighs 2 lb, 9 oz and is rated for 70 lb.

They are full suspension packs with laminated wood and carbon fiber stays. I don't have direct experience with either, but they seem well regarded.

Downsides are price and the ~6 week lead time.

I mean that gear should be different: stove, tent ...
Mine are 3 and 6 years (we plan more though), soon I will face same issues.

A family forum would be fantastic. My own kids are 4 and 6. The older one is getting 2 short trips this summer, the younger will go out next year probably. When hauling for 3 I'll definitely be consumed with (affordable) family UL packing tricks.