Gossamer Gear G4-20 Ultralight 42 Backpack

42 Litres / No Frame / Removable Padded Back / Hydration Compatible
Weighs 704g (Medium size)
Code: SS205671
  • £184.99
  • (FREE UK & EU Delivery)
+ In Stock Now | Usually dispatched within 24 hours

Gossamer Gear’s G4-20 Ultralight 42 Backpack is the newest addition to the line-up of the American ultralight specialist. At only 704g this is a truly lightweight pack, and while it does favour a minimalist approach, the G4-20 is a functional and comfortable option for the long-distance trekker.

Gossamer Gear says:

A modern nod to a vintage classic. A tip of the hat to an OG pack. We took what made the original "G4" so popular and roped in a gang of new fabrics and materials to create a minimal do-it-all frameless pack.

While Gossamer Gear's G4-20 Ultralight 42 Backpack is perfect for the minimalist hiker setting out on longer distance treks, the G4-20 is first and foremost a versatile pack with a bevy of features that make it an attractive companion for extended trips. This is a spacious pack, with a large main body complemented by a variety of stretchy side and front pockets for easy access to on-the-go essentials. The flexible nature of the G4-20 is its greatest strength – webbing on each side is perfectly suited to an ultralight shell or a pair of gloves, and the larger drop pockets on each side are ideal for water and snacks. The front pocket is remarkably deep, and proved perfect for carrying gear that is best kept isolated from your kit, such as a dirty footprint.

The G4-20 is also surprisingly burly, given its light weight, capable of carrying 12kg comfortably and 15kg at its limit. The Robic ripstop nylon used throughout is cleverly panelled to save weight without compromising on durability, and the backplate that doubles as a sit mat is an excellent innovation that balances class-leading comfort with year-round versatility. This isn’t purely a lightweight pack – features such as the sealed zip on the external valuables pocket, and the wide, well-padded straps are evidence that Gossamer Gear have managed to make this a comfortable, mid-volume pack for every outdoorsman.

- Reviewed by Ultralight Outdoor Gear

Help and advice:Choosing a rucksack at Ultralight Outdoor Gear
  • Extendable roll-top with dual closure options.
  • Waterproof zippers.
  • Removable molded cushy sitpad.
  • Fixed hip belt with unique hip belt pocket design.
  • 1.5" hip belt webbing for max comfort


  • Weight with sitpad: 674g
  • Weight excluding sit pad: 578g
  • Pack fit: 11.5" - 15.5" torso (29 - 40 cm) Generally fits people 5' 6" and under
  • Belt fit: 25" - 35" waist (64 - 89 cm)
  • Length: 19.25” (to extension collar seam)
  • Width: 11"
  • Depth: 5.75"
  • Extension collar height: 9"


  • Weight with sitpad: 704g
  • Weight excluding sit pad: 606g
  • Pack fit: 15.5" - 19.5" torso (40 - 50 cm) Generally fits people 5'5" to 5'11"
  • Belt fit: 30" - 42" waist (76 - 104 cm)
  • Length: 22” (to extension collar seam)
  • Width: 11"
  • Depth: 5.75"
  • Extension collar height: 9"



  • Weight with sitpad: 752g
  • Weight excluding sit pad: 628g
  • Pack fit: 19.5" - 23.5" torso (50 - 60+ cm) Generally fits people 5'11" and up
  • Belt fit: 32" - 50" waist (81 - 127 cm)
  • Length: 25” (to extension collar seam)
  • Width: 11"
  • Depth: 5.75"
  • Extension collar height: 9"

Capacity based on medium size

  • Total: 42L
  • Main Pack Body to Bottom of Extension Collar: 30L
  • Mesh and Side Pockets: 12L
  • Max Carry Capacity: 30 lbs
  • For Comfort: 25 lbs
  • 70D & 100D Robic Nylon DWR coating
Be the first to review Gossamer Gear G4-20 Ultralight 42 Backpack. Write a review ›
Contact us with any questions you have about this product