Love this pack, it's not crazy expensive like other sacks, it gets the job done and is extremely sturdy. Was able to fit all my weeks worth of clothing, typical camping gear as well as my camera gear with a tripod. The straps can get confusing at times but they're designed to keep everything together. Lots of little of hidden pockets and compartments to keep small items as well. The best part about this bag is probably the front-facing & side access you have to the main compartment, rather then unstrapping from the top and digging all the way to the bottom.

This is one phenomenal backpack from teton sports. I currently own two other packs from teton the 1200, and the talus 2700 and so far both have been a pleasure having, anyway onto the mountain 4000. With the 4000 you get soooo much backpack for the money its awesome that teton includes the pancho/tarp. Im a avid hiker who has climb multiple peaks above 10,000 feet and this here is going to be my go to now for camping or overnighters. I mangages to stuff in a mummy sleeping bag, a tent, 3 days worth of clothes, toiletries, a sleeping mat and inflatable pad, and still have room for a portable stove pans treking poles and a 3L bladder. Teton always makes incredible products.

:Update: so this pack has performed great on a 2 day camping trip in Zion National park, managed to fit about 25 pounds of gear comfortably throughout my visit. Just a small gripe, i was planning on taking this pack on socals highest Mountain, Mt San Gorgonio a 11,500 MT. My fault i should have reserached it but i notice it doesnt have any loops on the outside to hang an Ice axe, which is extremely odd since the Talus 2700 has several. Im sure i can find a way to hang one but it most likely will look really tacky. Id only removed half a star for that.

The backpack came in an undamaged package, which is great! Upon opening the box I smelt a new TETON Sports Mountain Adventurer 4000 Backpack. I've play around with this pack for an hour or so and all I can say is WOW!!! The construction of this pack is top notch! I don't like it when I hear people say for the money it is good... Simply put, whether it is the price I paid for it or $300 dollars, the quality is on par with the more expensive brands. All I can say is, thank you TETON for such an amazing product for an amazing price!
**Update**
Took the pack out for a day trip and realized one big flaw. The load lifters are ineffective for my 19 inch torso. I really love the craftsmanship of the bag, but having effective load lifters is a must when transferring weight between the shoulders and hips. After some research and deep thought, I will be keeping this backpack. I do appreciate having the freedom to move my head back without hitting the "wall."

My first backpack and I'm 75% happy. First, I used this to carry 3 days and 2 nights worth of gear. Zephyr 3-person tent - Teton pillow -Teton XXL pad - clothes - food - jet boil - misc items and 10lbs of food/water .

The area's you clip the caribinars are terrible if you use the zippers. They slide down and open up the bag. That only leaves the ability to use the chest strap areas which is stupid. I don't like having my towels, knife, selfie stick dangling in front of my face. They need to put stronger better zippers in the bag or at least a few hooks stationary in the bag to hang stuff on. Not related to the zipper

Also, 1 hip pocket at this price is stupid and ridiculous compared to its competitors like Osprey

I would happily trade this bag in and pay a bit extra for the 1 above it and the fancy fanny pack.

All in all its a decent pack and I maxed it out around 45/50lbs - personally go 1 higher IMO

We are big fans of Teton Sports because they deliver high quality products at affordable prices. Since we already had two backpacks, a couple of sleeping bags, a backpacking tent and my wife's favorite pillow in our arsenal, when I saw the Mountain Adventurer 4000, I knew I had to try it.

Loaded with all the features of the trendy brands, this pack had everything that I look for and more. It easily handled a 30 pound load with a separate sleeping bag compartment, lots of lashing points, hydration sleeve, external access points, map pocket, bottle pockets and so much more. The Mountain Adventurer is fully adjustable to fit a wide variety of body types. In my case, short and stocky, which isn't always easy to fit. This pack was a dream to carry. Ample padding and lots of adjustability! Perfect! Plus, in true Teton Sports fashion, they threw in a special treat... included in the hood compartment is a rain poncho/tarp shelter!! Who else does that?

This pack is worth so much more than the price I paid for it, and that is why I always go back to Teton for more. It's a rare thing to get MORE than what you pay for these days but this is a brand that delivers.

Great product from a great company operated by great people that love getting people outdoors. I'm a Teton Sports fan for life!