Ultimate Direction Fastpack 40

Built for moving quickly through big terrain, the Fastpack 40 combines the storage capacity of a traditional backpack with the fit and accessibility of a running vest. Designed for mountain missions, fastpacking adventures, and long days where self-sufficiency matters, it keeps essentials close at hand while maintaining comfort and freedom of movement.

Features

• Upgraded back panel system for improved breathability and moisture management

• New Infiknit™ and FastFlow back panel system designed to improve airflow and moisture management

• Roll-top closure expands or compresses depending on load size for a more adaptable fit

• Unique zip-down main compartment provides full access to gear without unpacking everything

• Large front storage and multiple quick-access pockets for hydration, nutrition, phone, maps, and essentials

• Removable and adjustable waist belt provides additional stability for heavier loads

Why ROAM loves the Fastpack 40

The attention to detail from UD is impressive, and this pack is a prime example. When you're packing 40L of gear, you need every box ticked - and this pack has it all. 

The running vest-style fit keeps the pack stable and close to the body, while the accessible front storage means you spend less time stopping and digging around for gear. The roll-top system also makes a noticeable difference — compressing neatly for lighter loads or expanding when extra layers and equipment need to come along.

Specifications

Capacity: 40L
Weight: 695g
Hydration Compatible: Yes
Front Phone Pocket: Yes
Ice Axe Loops: Yes
Safety Whistle: Yes
Bottle Included: No
Reservoir Included: No

Materials

Main Materials:

• MonoRip Mesh

• Nylon ACE RIP with STS coating

• Durable water-resistant four-way stretch woven mesh

Storage & Carry Features

• Large external stretch mesh pockets for fast access

• Two oversized side pockets for larger water vessels

• Easy-access security pocket with integrated key clip

• Sliding rail sternum straps for personalised adjustment

• Daisy chains for attaching additional gear

Sizing

S/M: 66–112cm lower rib measurement
L/XL: 75–135cm lower rib measurement

Measure around the bottom of your ribs while wearing the clothing you expect to use with the pack. Heavier pack loads generally create a closer fit, so if you're between sizes, keep intended load volume in mind.