Pack Files: LBT/Mystery Ranch Prototype Pack

Pack Files is a series that explores rare, forgotten, and prototype packs and accessories.

Overview

A unique pack appeared on eBay in late July 2026, a prototype London Bridge Trading (LBT) bag with a Mystery Ranch Leap Frame attached. It’s the first bag of its type I’ve seen and one worthy of looking at in more detail.

This pack is still available for purchase on eBay as of 21 August 2026. Photos included in this article are used with permission from eBay seller Coastal Virginia Sales.

Mystery Ranch Leap Frame

In 2001, Mystery Ranch released the Leap Frame, a successor to their 1999 Wrap Frame (US patent 6,626,342), both part of what they referred to as the “Mystery Ranch System.” The Wrap and Leap frames were ostensibly external frames but functioned more like internals, riding close to the body (“wrapping” around a user) and being usable only with a dedicated packbag.

The frames utilized a fiberglass rod, attached through the frame and secured to the packbag, to provide rigidity to the packbag and transfer the bag’s load to the frame. The majority of the packbag’s weight was transferred to the bottom of the frame through this fiberglass rod. Wingtips on each side of the frame’s lumbar section secured to hipbelt pads that were permanently attached to each packbag. The system was complicated, requiring an 11-step process to remove or attach a bag, but worked remarkably well in terms of load transfer and comfort. The system’s short life can be attributed to its complexity, poor documentation, and the fact that a local dealer was required for sizing (the Wrap Frame came in 6 sizes, the Leap Frame 8 sizes).

Wrap Frame description from Mystery Ranch catalog, circa 2000.

LBT/Mystery Ranch Prototype Pack

The bag is distinctly LBT and appears to be a unique design, being somewhat similar in size and layout to the LBT-1749B (10 Pocket Ruck) but with notable differences. Writing throughout the pack records the dimensions and volume of the pockets, clearly denoting this pack as a developmental prototype.

Handwritten size & volume markings.

The packbag appears to be sewn entirely by LBT, while the frame and its attachment components are all done with materials Mystery Ranch would’ve had in-house, making it possible a largely completed bag was sent to them by LBT for frame attachment and testing. The gray carry handle stands out as the Ti/castor grey color from their BDSB project, which entered production in 2003 (foliage green as a standalone color likely didn’t exist until sometime in 2004). The NICE Frame, Mystery Ranch’s ALICE-compatible external frame, would appear on their website in summer 2004, and the Wrap and Leap Frames would be discontinued at its introduction. The carry handle color and NICE Frame debut date this prototype pack to 2003-2004.

Close-up of the Ti/castor grey carry handle.

The origin story of this pack is unknown, but we can speculate: Mystery Ranch may have been looking to continue working with outside companies, as they had with Kelty in 2001, and, inspired by their military contract for the BDSB pack, may have gotten into talks with LBT to develop an ALICE-style ruck. Maybe LBT sent a bag design to Mystery Ranch, probably with their initial input (using elastic around the outer pockets doesn’t seem like standard practice for LBT), and Mystery Ranch attached their frame to it in-house.

To speculate even more wildly: It’s possible this pack was part of the journey towards the creation of the NICE Frame. If Mystery Ranch was working with an ALICE-style packbag and modifying it to work with their existing Leap Frame, they may have seen the opportunity in working the other way around- creating an external frame system to work with any ALICE pack, which is what the NICE did.