F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe
F1 Mainframe

F1 Mainframe

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The Most Versatile Pack Ever

Regular price Sale price $249.00
Volume: N/A
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The F1 Mainframe represents what is arguably the most durable and versatile pack frame on the market. The F1 features a tubular aluminum frame to provide its unparalleled strength while maintaining ultra-light capabilities. Tested to hold more than 700 lbs., this ultra rugged frame utilizes YKK zippers to allow the attachment of a variety of packs and accessories to fit any backcountry hunt. Experience premium comfort unlike the rigid frames of the past, as the Mainframe was designed to fit ergonomically correct, distributing the weight properly across the hips and shoulders.


  • The Vapor 2500, 5000, or 7500c.i. for any length adventure with ultra-light considerations. 
  • Use 2 Batwings when you plan to go in light and come out heavy. Stay quick, light, and mobile with the Batwings. They are intuitive and make packing out meat simple.


  • Pair with the Spike Duffel or Dry Bag with Batwings for a 2-4 day hunt. Pack all of your gear into the backcountry and when you reach camp and drop your gear, unzip the duffel or dry bag and hunt in your ultralight Batwing setup.
  • If you like the organization and function of a backpack, the new Vapor 5000 is the ideal choice for a 2-5 day trip. Allows for top-loading or front-loading access and use the Mainframe when it is time for some heavy lifting.


  • For a 5-10 hunt, use the new Vapor 7500. Pack all of your gear into the backcountry and when you reach camp and drop your gear, the Vapor series with collapse nicely against your frame to allow you to day hunt out of your camp.

Recommended for: 

  • Hunting

Recommended Add-Ons:

We expect our customers to be happy with our products, and the very low rate of returns that we get tells us that we’re on the right track. If you need help with something, or don’t understand how something’s supposed to work, the first thing that we invite you to do is to contact us. We’ll be glad to spend what time is necessary to solve your problem.

Eberlestock will issue a full refund for any item still in new and sellable condition that has been returned within 45 days of purchase directly from Eberlestock. Items purchased through alternative sites or dealers must be returned to them. We politely request you return items with the original tags still attached if possible. In some cases, missing tags and bags may result in a 10% restocking fee. Items with excessive pet hair, odor or dirt will be returned to the purchaser without refund.


  • Intex ll aluminum frame.
  • Zippered attachment points compatible with our duffels, drybags, and more.
  • Full MOLLE webbing matrix covers main panel to attach scabbards, pouches, etc.
  • Three built in horizontal compression straps for securing your gear.
  • Adjustable ladder harness system. Makes customizing the fit quick and easy
  • Lifetime manufacturers warranty.


  • Tall version is 3.5" taller than the regular size
  • Designed for those with extra-long torsos or prefer higher load-lifter straps
  • Tall Mainframe is compatible with the same accessories and packs as regular Mainframe


  • Weight: 4 lbs 5 oz
  • Dimensions: 26"h x 11"w


  • Weight: 4 lbs 8 oz
  • Dimensions: 29.5" x 11"w

Customer Reviews

Based on 221 reviews
Best modular pack on the market

I am 6' 2" and weigh about 210lbs, I tried on several Eberlestock non-modular packs at a local store and I didn't care for the lumbar support or the way the waist band felt on my hips. I was told that Eberlestock had issues for bigger guys however The F1 Mainframe fixes both of these issues for me. It is SUPER comfortable and has great support! I got the XL Mainframe so I had some room between the pack and the Mainframe. I plan to set my tent and sleeping pad on the Mainframe shelf under my pack for hiking. I got their new Vapor pack to go with the Mainframe and hope to add a couple Batwings to the collection once they're back in stock. I had both my kids get on the Mainframe (about 120lbs) and I went on a short walk, the pack felt great under weight. I am excited for fall when I get to pack out a deer on this thing!

MainFrame & Vapor 5000

After first weekend of use, I’m satisfied with load bearing, pack weight and design. I’m recommending it to friends who elk hunt with me. Quality control missed a flawed zipper keeper.

Main frame review

The pack is great, the only problem i have is a few things I wanted for it like the batwings were on backorder last I checked which makes the pack not as useful as I was expecting.

F1 Mainframe

Love it!! Its light, strong but very sturdy..

Great mainframe, very sturdy yet lightweight.

Have two of these, a tall for myself, and a standard height for my wife. We have the batwings on one, and the F5 switchblade on the other. Both have a Zip-On Dry Bag should we need the extra space. These are both very versatile setups, all made possible from the mainframe.