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Hydro II

Hydro II

The Constrictor was developed with a spinal surgeon from the RCP (Royal College of Physicians) and complies with BS 13407-1999. All the rucksacks have a stress tolerance to exceed 100 kilos pay load.

Designed to protect the spine and distribute weight correctly along the back, reducing wear and problems later in life with the lumbar region of the spine. All the bar-techs machined-in exceed the industry standard and have set new breaking strains – to the point where the rucksacks will not only allow a wounded colleague to be dragged to safety, but will in fact tow a transit van. (Torque on a transit van is 3200nm, our breaking strain is 3411nm)

HYDRO II title here

A top loader with front panel access it offers unique options with our patented back system reduces the amount of energy expended whilst on the move, enhancing the wearer’s performance for longer periods of time.

Available with Jump Lines for airborne insertion, and with our flex panel for JPC compatibility


BS 13407:1999 – Human-centred design processes for interactive systems

ISO 105 B02: 2000 amdt 2.2000 – Tests for Colour Fastness

ISO 13934-1-1999 Tensile testing standard determining fabric strength

ISO 13937-2000 Textiles – Tear properties of fabrics — Part 1: Determination of tear force using ballistic pendulum method (Elmendorf)

ISO 811-1981 – Textile fabrics — Determination of resistance to water penetration — Hydrostatic pressure test

FMVSS 302 title 49 section 571.302 – Flammability of interior materials (Phosphorous test)

BS 5131, part 11: 1981 (1992) Buckle Strength (derived from foot wear as no vest standard existed)

ISO 2062: 2009 – Textiles — Yarns from packages — Determination of single-end breaking force and elongation at break using constant rate of extension (CRE) tester.


BS 3084: 2006 performance code c – Slide Fasteners

STANAG 2895 Extreme climatic conditions and derived conditions for use in defining design/test criteria for NATO forces materiel. Operational Zones from -40° to +50°

EU Regulation 1907/2006 REACH – 138 substances in candidate list.

BS 5131, Part 11 : 1981 (1992) Tear Strength of straps (derived from foot wear as no vest standard existed)


Black, Green, Coyote, Multi-Cam, Wolf/Urban Grey


A jump option is available upon request at technical@cribgogh.com 


contact us

For more information on the system please contact us at info@cribgogh.com or call us