Gear Review: Custom FKP Backpack By Exotic Pack Co

The Custom FKP by Exotic Pack Co is a practical and streamlined ultralight pack designed for big miles and bold hikers. We tested it on 14ers in the Sangre de Cristos and deep down into the Grand Canyon to see how this custom pack performs in demanding terrain.

Gear Review: Custom FKP Backpack By Exotic Pack Co
Pausing near an alpine lake while testing the fast-access shoulder pockets of the Exotic Pack Co FKP. This pack excels at big elevation days.

Looking for a high-performance ultralight backpack that’s dialed for speed, stability, and long-haul comfort? The Custom FKP (Fastest Known Pack) by Exotic Pack Co is built for hikers, runners, and fastpackers who value sleek design, ultralight materials, and the ability to customize every last detail.

 Hiker crossing a log bridge with the Exotic Pack Co FKP ultralight backpack in the Grand Canyon.
Crossing a log bridge rocking the Exotic Pack Co Custom FKP loaded for a multiday fastpack. This backpack handled rugged terrain and big water carries with ease.

I’ve been using my own Custom FKP for big hiking days, and it’s been especially amazing on 14ers in the Sangre de Cristo Mountains and for rugged days venturing into the Grand Canyon.


Standout Features

The FKP isn’t your average cottage pack: it’s a full-on bespoke experience. The customization options are deep, from capacity and torso size to shoulder strap style, top closure, pocket configurations, and even bonus features like built-in bear spray holders or internal loops for water bottle storage. You chat with the owner of the company to create the perfect pack for you!

Some highlights from mine:

  • Custom Volume and Fit – Tailored perfectly to my torso length and chest size, which makes a massive difference on long days and steep vertical gain.
  • Hybrid Shoulder Harness – Supportive but flexible enough for scrambling on rocky Sangres ridgelines.
  • Modular Compression System – Keeps the pack stable and tight, especially helpful descending steep Grand Canyon trails.
  • Highly Water-Resistant Materials – I opted for Ultrastretch pockets and Ultragrid body fabric. It's fantastic for surprise alpine storms.
  • Fast and Functional – Whether climbing up Kit Carson or navigating through the canyon's inner routes, this pack moves with me.
 Hiker wearing the Exotic Pack Co Custom FKP ultralight backpack in the snowy Sangre de Cristo Mountains.
Climbing toward a high alpine pass in the Sangre de Cristo Mountains with the Custom FKP pack by Exotic Pack Co keeping weight low and storage efficient.

Having a pack dialed to your needs really becomes apparent in big terrain. I barely notice it when I’m wearing it, and that’s the dream.


Pros and Cons

ProsCons
Custom-fit and fully modularLead times can be long
Exceptional weight-to-function ratioPremium pricing
Stays stable even at speed
Made by a passionate small brand

Packing It Out

The Custom FKP is one of the best-kept secrets in the ultralight world. It’s for folks who want to move fast, pack smart, and get a backpack that truly fits their body and style. If you’re tired of packs that almost work for your setup, the FKP is your answer.

 Black Exotic Pack Co Custom FKP ultralight backpack displayed upright on wooden planks with visible pockets and straps.
The back view of the Exotic Pack Co Custom FKP, showing off its sculpted shoulder pockets and modular ultralight design.

From exposed Colorado summits to remote desert canyons, my Custom FKP has crushed it. Exotic Pack Co is a small but mighty brand doing big things, and this pack proves it.


My review is independent of the supplier and reflects my own opinions. Some of the links on this page are affiliate links, which means I may receive a small commission if purchases are made through those links at no additional cost to you.