I have walked thousands of miles with packs on my back, from week-long Sierra trips to hunting elk in Wyoming. The internal versus external frame debate sounds dated, but both styles still have a place. Here is what each does well, plus the specific packs I would buy depending on what you carry and where you go.
| Pack | Frame Type | Capacity | Best For |
|---|---|---|---|
| Osprey Atmos AG 65 | Internal | 65 L | Trail backpacking |
| Gregory Baltoro 75 | Internal | 75 L | Heavy multi-day loads |
| ALPS Mountaineering Commander | External | 86 L | Hunting and pack-out |
| Kelty Trekker 65 | External | 65 L | Budget heavy hauling |
| Mystery Ranch Bridger 45 | Internal | 45 L | Weekend trips |
Osprey Atmos AG 65
This is the pack I grab for any trip three to seven days long. The Anti-Gravity suspension has a tensioned mesh back panel that hugs your spine without touching it, which means airflow even in summer heat. Load transfer to the hips is the best I have used on an internal frame, and the hipbelt has a real adjustment range. I have carried 38 pounds in this pack for nine straight days and felt fine. The lid converts to a daypack, which is handy for summit pushes.
Gregory Baltoro 75
When the load gets heavier than 40 pounds, the Baltoro is my pick. It has a more substantial aluminum frame than the Atmos, a thicker hipbelt, and the Response A3 suspension that pivots with each step. I took it on a glacier traverse with 55 pounds of gear and it carried beautifully. The downside is weight, around five pounds empty, which is heavy by modern standards. But if you carry winter gear, a bear canister, or rope and rack, that extra frame pays off.
ALPS Mountaineering Commander
This is a true external frame pack with a freighter-style aluminum frame. I bought it for hauling elk quarters out of the backcountry, and it does that job better than any internal frame I have tried. The frame extends above the pack bag, so you can lash a quartered animal, a deer, or a heavy bag of gear directly to the frame. It rides high and tall, which keeps weight over your hips. For trail backpacking it would be overkill, but for hunters and pack-out hikers it is the right tool.
Kelty Trekker 65
The Trekker is the modern descendant of the classic 1970s Kelty external frames, and it still works for the same reasons. The tubular aluminum frame ventilates your back, which is huge in hot weather, and the load sits high for upright walking on graded trails. It is not built for technical scrambling, but for Boy Scout trips, fire road treks, and any time you are happy with a basic, no-frills hauler, it is hard to beat the price.
Mystery Ranch Bridger 45
For weekend overnights or fast-and-light three-day trips, the Bridger 45 is what I bring. Mystery Ranch builds packs like military gear, with bartacked stitching at every stress point and a Y-zip opening that lets you get to the bottom of the bag without unpacking everything. The internal frame is a single aluminum stay paired with HDPE sheets, which keeps weight reasonable while still transferring loads to your hips. I have carried this pack for six years and it still looks new.
How to Choose
Pick frame style by what you carry, not by tradition. Trail backpackers with shaped gear and loads under 45 pounds want an internal frame for balance and stability. Hunters, freighters, and anyone strapping odd loads to the outside of the pack want an external. Then fit matters more than features: measure your torso, try the pack with weight in it if you can, and walk around the store for ten minutes before deciding. A great pack that fits wrong is worse than a basic pack that fits right.
Frequently asked questions
Are external frame packs obsolete?+
Not for heavy, oddly shaped loads. Hunters and pack-out hikers still prefer them because they ride high, ventilate better, and handle 60-plus pound loads without crushing. For trail backpacking, internal frames win.
What pack weight is the cutoff for needing a real frame?+
Around 25 pounds. Below that, a frameless ultralight pack works fine. Above 35 pounds, you want a proper aluminum or composite frame to transfer weight to your hips.
Do I need a custom torso fit?+
Yes, especially over 30 pounds. Measure from your C7 vertebra to the top of your hip bones and match the pack size chart. A pack that is even an inch off rides wrong all day.