Osprey G4-20 Ultralight 42 Backpack

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UOG TOP PICK – 2024 G4-20 Ultralight 42 Backpack – The G4-20 Ultralight 42 Backpack by Gossamer Gear is ideal for minimalist hikers undertaking extended treks. Upgraded with 70D Recycled Robic Nylon as the main material and strategic reinforcements of 100D nylon in high-wear areas, the new G4-20 is lighter and more durable than its predecessor.

Gossamer Gear says: 

We took what made the original “G4” so popular and roped in a gang of new fabrics and materials to create a frameless, do-it-all companion for thru-hikers and weekend warriors. The G4-20 is made for ease on trail. Each buckle, zipper, and cord has been scrutinized for lightweight function. Get ready to meet a simple, cost-effective pack designed to lighten your load.

Our Verdict

The G4-20 Ultralight 42 Backpack by Gossamer Gear is the perfect companion for the minimalist hiker embarking on extended treks. Despite its lightweight construction, the G4-20 is exceptionally versatile, boasting many features that make it suitable for longer journeys. The pack features a spacious main compartment complemented by stretchy side and front pockets, ensuring easy access to essential gear on the go. Its adaptable nature is a key strength, with webbing on each side ideal for carrying an ultralight shell or gloves and larger drop pockets on each side ideally suited for water bottles and snacks. The remarkably deep front pocket is ideal for isolating items like dirty footprints from the rest of your gear.

Recently, the pack was upgraded with 70D Recycled Robic Nylon as its main material. Strategic reinforcements of 100D nylon have been added to enhance durability in high-wear areas like the seat, which also provides improved water resistance. Consistent with Gossamer Gear’s “Take Less, Do More” ethos, the buckles, zips, and cords have been reevaluated, resulting in a lighter and more durable pack compared to the previous model.

– Reviewed by Ultralight Outdoor Gear

Features

• Extendable roll-top with dual-closure options
• Removable, molded, cushy sitpad
• Fixed hipbelt with unique pocket design
• 1.5” hipbelt webbing for max comfort
• Tough recycled Robic fabric

Specifications

Small

• Weight including SitLight Pad: 633g
• Length: 19.5” (to extension collar seam)
• Width: 11.4″
• Depth: 4.7″

Medium 

• Weight including SitLight Pad: 688g
• Length: 23.6” (to extension collar seam)
• Width: 11.4″
• Depth: 4.7″

Large

• Weight including SitLight Pad: 719g
• Height: 25.6” (to extension collar seam)
• Width: 11.4″
• Depth: 4.7″

Capacity

• Total capacity: 42L
• Main Pack Body to Bottom of Extension Collar: 30L
• Mesh and side pockets: 12L
• Max carry capacity: 30 lbs
• For comfort: 25 lbs

Material & Construction

• 70D & 100D Recycled Robic Nylon
• PFAS-free

Help & advice:

• The Ultimate Guide to Choosing an Ultralight Rucksack
• Time-Saver Guide to Choosing a Rucksack
• Recycled Content in Outdoor Gear