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  • TETON Sports Explorer 4000 Internal Frame Backpack (Grey)
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TETON Sports Explorer4000 Internal Frame Backpack

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List Price: $139.99
Price: $72.01 & FREE Shipping. FREE Returns. Details
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  • Multi-position adjustable torso adjustment fits wide range of body sizes
  • Rugged internal frame backpack with capacity of 4,000 cubic inches large enough for 2-5 day trips
  • Pass-through side pockets accommodate tent poles or long gear behind pocket
  • Top and bottom compression straps to secure sleeping bag, pad, or tent
  • The back and hip padding made of durable open-cell foam with lumbar pad and molded channels provides maximum comfort and allows airflow
  • Integrated bright yellow water-resistant rainfly
  • Limited Lifetime Warranty
7 new from $70.40

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Frequently Bought Together

TETON Sports Explorer 4000 Internal Frame Backpack (Grey) + Magnesium Fire Starter
Price for both: $75.96

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Product Description

Product Description

Great multi-day pack, adjustable for large or small frames. Innovative torso adjustment and moldable aluminum stays give just the right fit. Take time to customize fit before you start hiking. Loaded with little extras including waterproof zippers on side pockets, Velcro on center mesh pouch, daisy chain loops for hanging gear and double barrel-lock cinch cords on main compartment. Padded bladder pocket is inside bag against back for easy access and accommodates up to 3 liter bladders. Both shoulder straps have hydration tube bungees.

With pockets, pouches, loops and straps, you can hang, tie or tuck away all the gear for a 2-5 day trip. For longer trips, check out TETON Sports Fox5200. For a smaller pack, see the TETON Sports Scout3400.


The Explorer 4000 is packed with features normally found only on more expensive backpacks such as a full-length adjustable torso that allows this pack to be adjusted for those 5 feet, 1 inch tall all the way up to 6 feet, 4 inches tall. The padded back and airflow system provides padding in the perfect spots while allowing substantial airflow to prevent your back from getting too hot. Its contoured shoulder, lumbar, and hip pads help ensure a comfortable trip. The Explorer 4000 also features a padded water bladder pocket for your favorite water bladder up to 3 liters in size. Side zippered pockets, mesh pockets, and a top zippered pocket provide plenty of room for smaller accessories. There's even two spots for walking sticks. A top-loading main compartment and a sleeping bag compartment complete the pack. Includes bright yellow attached rain fly and is hydration system ready.


  • Rugged, internal frame backpack with 4,000 cubic inch capacity
  • Dual aluminum stays adjust to the contour of your back
  • Full-length adjustable torso and adjustable shoulder straps for a more comfortable fit
  • Padded shoulder straps, padded waist belts and padded lumbar area for maximum comfort, with airflow system to reduce heat
  • Separate sleeping bag compartment
  • Includes a bright yellow attached rainfly and is hydration system ready
  • Height-adjustment shoulder straps accommodate a wide range of torso lengths


  • Capacity: 4,000 cubic inches
  • Dimensions: 34 by 18 by 12 inches (full capacity)
  • Pack Weight: 5 lbs
  • Shell: 600D Diamond Ripstop

Product Details

Color: Grey
  • Product Dimensions: 18.1 x 12.2 x 34.2 inches ; 5.1 pounds
  • Shipping Weight: 5.3 pounds (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B001947FG8
  • Item model number: 163
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (559 customer reviews)
  • Amazon Best Sellers Rank: #1,142 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
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Customer Reviews

The straps are adjustable and very comfortable.
I was able to pack more than what I needed and was even able to fit a 20 degree sleeping bag into the sleeping bag compartment, it's a very tight squeeze though.
Trevor Williamson
Lots of easy access pockets and nice compartment for the sleeping bag.

Most Helpful Customer Reviews

379 of 385 people found the following review helpful By Curt Daniels on July 15, 2009
Color Name: Grey
I read the earlier review about the sleeping bag pocket being too small, but bought this backpack anyway. Sure enough, you weren't lying! As soon as I took the backpack out of the box, I grabbed my sleeping bag and tried to stuff it in there. After about 5 minutes of jockying it around, I did manage to BARELY get the thing zipped up. However, the sleeping bag I used is my summer bag. If I tried to stuff my winter bag in there, with bivy sack and stuff sack, there's no way it would all fit. This can be a problem if you're intending on doing a legitimate backpacking trip in high altitudes with cold weather. All this being said, I'm in the Army and I take a different approach to this issue than most civilian hikers probably do. In my opinion, you don't need to have your sleeping bag available for quick access. The only time you use it is at night, when you'll have time to dig in your bag and get it anyway. Since the sleeping bag pocket is too small, just throw your sleeping bag in the big compartment...this compartment is large enough to easily hold a winter bag. Use the sleeping bag compartment for more important items that you might actually need to access quickly (medical kit, rain gear, flashlight, signaling device, GPS, knife, etc.) Therefore, problem solved. No need to return the bag.

Another negative I saw mentioned in a previous review is all the excess straps that hang loose. Not a problem...just get some 100mph tape and tie it all down. Too easy.

The rest of the pack seems to be quality. The material seems durable and there is a good deal of padding along the back and straps for a comfortable fit. Everything is adjustable so you won't have any problems getting this backpack to fit all shapes and sizes of hikers.
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307 of 312 people found the following review helpful By Cyclist01222 on July 16, 2010
Verified Purchase
Length: 3:26 Mins
I have been looking at packs for a few weeks and decided to purchase the Teton Explorer 4000(Gray) because of the features, good reviews and bargain price. It arrived today and I'm not disappointed! The shipping box was in sad shape, dunnage was minimal and the packing tape was messed up but the pack was unmolested inside a plastic bag. That was the worse part.

I don't concur with some of the negatives described in other reviews here. The zippers do not stick, they open and close just fine. I don't know how one can declare the sleeping bag compartment too small... compared to what? This is a 4000ci bag and advertised as such... it is what it is. I did fit my Sleep Cell 30 degree mummy bag in there no problem. I could even squeeze in a few extra items. I can fit two of my 50 degree summer bags in also... together. Yes, if you have a giant, fluffy, 5 lb, -20 degree winter bag, it probably won't fit here. This is a med sized, 4000ci backpack designed to carry backpacking style sleeping bags, not ones designed to drive to the cabin or car camp. I hope this clears things up if you're hesitant due to other reviewers dubbing it "too small"... it fits most common bags just fine for a 4000ci pack. Besides, having to compress your bag and squeeze it in compacts your load and saves weight - stuff sack not needed. This is the best way to pack a 4000ci backpack! Use waterproof bags to protect sensitive items where needed.

The material seems to be of good, sturdy quality. The straps and buckles are very sturdy also and I see no difference after comparing them to the straps and buckles on Kelty, Jansport or Northface bags I examined in stores. If they do break, Walmart sells buckles and straps for pennies - made by Outdoor Products. I will carry extra with me when I use it.
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251 of 258 people found the following review helpful By B. Dobson on May 11, 2010
I must start by saying that I've grown very fond of this bag. I've been backpacking and WWOOFing through Europe for over 9 months and I still have a few to go. This bag is basically my home.

Let's start with the pros. PRICE - quite affordable for a bag of its class. There are many convenient pockets and straps. I'm able to fit everything I need to survive. It's effectively waterproof and has the rain-fly thing for heavier rains. The material is extremely durable - hardly a scuff on it and not a single tear in any of the fabric (seams are another story; see below). It shrinks down alright when not fully stuffed. And most importantly, when adjusted correctly, it IS comfortable. This is crucial for me, as I've been doing a fair amount of hitchhiking and find myself walking 5-15km at a stretch if is lady luck isn't shining.

If it's got all of those pros, what cons could possibly drive me to only give it 3 out of 5 stars? The seams. Zippers, straps and buckles have busted seams. It started VERY early. Within only a couple weeks of use, the inner adjustable velcro strap that folds over the left-side interior aluminum back brace tore its top seam; the bag has sat crooked since then. The seam around the zipper on the bottom where the rain-fly is stored is giving way, and I've used that only a handful of times. After about 2 months of heavy use, the seam holding the buckle on the bottom right strap broke, as did the lowest of the four seams connecting that strap to the front mesh pocket area (I used these straps to hold my heavy coat when I'm not wearing it - I was able to reattach the buckle using duct tape, needle and thread). Luckily, none of these have been enough to put the bag out of commission.
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Most Recent Customer Reviews