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

The Most Versatile Pack Ever

Regular price $249.00
Volume: N/A
Shipping calculated at checkout.

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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 196 reviews
F1 mainframe

Everything seems great. Not 5 because I have not done a heavy pack trip yet. Will know more this fall!

Bomb Proof

3 of us used this pack in Alaska on a DIY moose hunt. They worked flawlessly training through the summer starting at 40lbs all the way up to 125lbs. Moose quarters rode nicely on the pack and was about as comfortable as 125lbs could feel. It'll be going on many more adventures. Love the pack. I'm 5'11" and got the Tall Frame and am glad I did.

MY pack

Bought into the hype around another company’s high in pack. Used it in Wyoming in 2019. Not saying it was a bad pack, it was designed for everyone, not me.
Sold it and picked up a F1 tall. Started slow adding pieces. A rifle scabbard, saddlebag, batwings, drybag and Transformer.
I now have the ability to put together a pack for any given hunt. Hike in, set camp and drop gear. Get the pack down to the bare minimum that I need for day hunts.
Life doesn’t get much better than that in my opinion.


Great pack super versatile and expandable!

Great Frame

I use it for bringing tools with me, when I have to do works out in the woods to repair stands.
Extremly versatile and light (when it's empty)