Caiman 40 Spec Sheet

Caiman 40 waterproof backpack covered in snow
Product spec sheet

Caiman 40

Waterproof. Rugged. Spacious.

A fully welded, 40-litre waterproof roll-top backpack built for demanding conditions, heavy loads and years of hard use. It prioritises waterproofing, durability and external carry over internal organisation. A bag for serious use in serious conditions.

Capacity Approx. 40L (1 roll) / 35L (2 rolls)
Dimensions 60 × 30 × 22 cm (H × W × D), loaded, 1 roll
Weight Approx. 1.5 kg
Main body 500D PVC tarpaulin, fully welded seams
Closure Roll-top: clip over the top, to the sides, or with over-the-top straps
Colours Jungle Green · Storm Grey
40LCapacity
60cmHeight
1.5kgApprox. weight
500DPVC tarpaulin
WeldedSealed seams

01Colours

Two colourways, same spec.

Caiman 40 backpack in Jungle Green

Jungle Green

SKU JCCB40GN

Jungle Green body with black features and contrast stitching.

View Jungle Green
Caiman 40 backpack in Storm Grey

Storm Grey

SKU JCCB40GY

Storm Grey body with black features.

View Storm Grey

02Specification

Construction

  • Heavy-duty 500D PVC tarpaulin main body
  • Fully welded seams keep water, dirt and sand out
  • Single waterproof main compartment

Capacity & closure

  • Approx. 40L with 1 roll, or 35L with 2 rolls
  • Roll-top clips together over the top or down to the sides
  • Additional over-the-top webbing straps

Dimensions & weight

  • 60 cm H × 30 cm W × 22 cm D (fully loaded, 1 roll)
  • Approx. 1.5 kg

External storage & attachment

  • Front zip pocket with water-resistant zip
  • Elasticated front webbing for attaching gear
  • 4 × 2 MOLLE / PALS webbing grid
  • Daisy chain webbing on both sides
  • 2 large drawstring bottle pockets (bottles up to 8 cm diameter)
  • 4 front D-rings and 2 shoulder strap D-rings

Carry & fit

  • Padded shoulder straps with tension adjusters
  • Sternum strap and waist strap
  • Padded foam back panel with airflow channels
  • Sturdy top carry handle

03Features at a glance

Jungle Green Caiman 40 with its key features labelled

04Dimensions

60 cm 30 cm 22 cm FRONT SIDE
Height 60 cm
Width 30 cm
Depth 22 cm
Capacity Approx. 40L (1 roll) / 35L (2 rolls)
Weight Approx. 1.5 kg
Bottle pockets Up to 8 cm diameter

Measured fully loaded with 1 roll

05In the field

  • Reviewed by BASE magazine.
  • On expedition in Borneo with Mad Dog Adventures. The veteran-owned expedition team took a Caiman 40 to the Borneo jungle in October 2026. It did double duty: a carry-on for the flight out, then keeping cameras and medical kit dry in the jungle. Their verdict: "it handled the jungle with ease."
  • Heading across the Atlantic with Team Rogue Wave. This December, Patrick, Henry, Harry and Alex row 3,000 miles from La Gomera to Antigua in the World's Toughest Row. There's no support boat, they row two hours on and two hours off, and everything that has to stay dry goes in the Caiman 40. They're raising money for The HALO Trust and the Clocktower Foundation.
Caiman 40 backpack on a snowy hill
Snow & hills
Caiman 40 waterproof backpack outdoors
All-weather
Man wearing the Storm Grey Caiman 40 while walking a grey dog
Everyday walks
Caiman 40 backpack with a horse in the background
Countryside

06Good to know

Waterproofing

The main compartment is fully waterproof. The front zip pocket is water-resistant only, so keep anything that must stay dry in the main compartment.

Electronics & submersion

Put phones and other electrical items in a suitably IP-rated case inside the dry bag. The Caiman 40 is not rated for submersion.

Care

  • Rinse off dirt or salt with fresh water
  • Dry thoroughly before storing
Jackson & Cole · Caiman 40 · Spec sheet Shop the Caiman 40