Big Agnes Grit 28L Rucksack

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A stable, dialled-in fastpack with smart storage and comfort that punches above its weight.

Gossamer Gear says: 

Stay (ultra) light on your feet with the Grit 28L Fastpack. Its streamlined design, refined buckles, and vest-style harness shave base weight ounces without compromising comfort, so you can shave seconds off your personal record.

Vest-Style Harness – The double sternum strap and vest-style wrap minimize bounce so you can focus on the trail ahead.

Ultralight Hardware – We meticulously scrutinized every component to maximize ultralight performance.

All-New Fabrics – The Grit is designed with two new fabrics: the Riptide fabric, made from 100D Recycled Ripstop, and an extra-durable UHMWPE Stretch Mesh.

Our Verdict

The Gossamer Gear Grit 28L Rucksack blends vest-style stability with ultralight design without skimping on practical details. At 464g, it’s built for fast packers and minimal kit days, but its carry feels more secure and stable. I particularly like the broad, well-cushioned shoulder straps and their wealth of storage, including a zipped phone pocket that’s usable mid-stride.

The stretch mesh on the front and side pockets is tough and holds shape well, and the roll-top closure keeps things streamlined. You get thoughtful extras like trekking pole carry, soft flask support, fastbelt attachment points and external tie-on loops that allow for compression or extra gear lash-on when needed. The back panel is removable, and there’s a loop for hanging a hydration bladder if required.

It’s a fantastic pack for fastpacking, long day hikes, or ultralight overnights.

– Reviewed by Ultralight Outdoor Gear

Features

• Vest-style harness with ultralight perforated cushioning.
• Shoulder strap zippered phone pouch.
• Soft flask front pocket with a top elastic strap to minimize bounce, plus a safety whistle.
• Double sternum straps.
• Cushioned, ergonomic shoulder straps with perforated foam.
• Tie-on points for compression and gear customization.
• Roll-top closure designed to fasten down the sides.
• Quick-adjustment V-style shoulder strap system.
• Removable Sitlight Pad back panel; can be replaced with a 17” Airflow Pad.
• Webbing thumb loops.
• Trekking pole attachment system and ice axe loop.
• Fastbelt attachment points for additional load transfer.
• Front and back reflective components.
• Interior hanging loop and tube routing for a reservoir.
• Top carrying handle.
• Glove-friendly buckles.

Specifications

• Weighs: 464g
• Height: 19” / 48.3 cm to the extension collar
• Height: 27” / 68.6 cm to the top
• Width: 11” / 27.9 cm
• Depth: 5.75” / 14.6 cm

Capacity

• Total (Does not include vest pockets): 28L
• Max Carry Capacity: 25 lbs
• For Comfort: 20 lbs

Material & Construction

• Riptide Ripstop, 100D Recycled Robic Nylon
• UHMWPE Stretch Mesh
• PFAS-free

Help & advice:

• The Ultimate Guide to Choosing an Ultralight Rucksack
• Time-Saver Guide to Choosing a Rucksack
• Why is ‘PFC Free’ Important?