easily Verify container weight - as you load

SOLAS VGM Method 1 Verification System

BISON C-Jacks are a complete and portable system for weighing shipping containers on the ground and on chassis. 

Fast, accurate and easy-to-use, C-Jacks save you time and money by weighing containers at the most convenient time and location for your business. 

  • Avoid weighbridge costs & delays
  • Maximise container loads
  • Stop overloading
  • Trade with confidence
  • Streamline your loading process
  • Earn revenue from VGM weighing services

Integrated with the BISON VGM APP for rapid results.

Trusted by

DSV Logo2 GE Logo kuehne nagel logo transparent3 US air force logo transparent NASA Logo NATO logo transparent

Watch them in action

Weigh Containers on Ground

Weigh Containers on Chassis

How do C-Jacks work?

  • C-Jacks comprise four portable scales, which attach to the corner castings of any ISO container.
  • Using hydraulic bottle jacks, the container is safely lifted just clear of the ground or chassis.
  • The load at each corner is sent wirelessly to a central indicator, and to the BISON VGM App, giving you a highly accurate gross container weight.
  • C-Jacks have a 35,000 kg (77,000 lb) weighing capacity 
  • C-Jacks can handle ISO containers of all types and sizes, including high cubes, reefers, flat racks and ISO tanks.

Why use BISON C-Jacks?


Weigh all ISO containers types and sizes anywhere, anytime, including high cubes, reefers, flat racks and ISO tanks.


35,000 kg (77,000 lb) weighing capacity. Each jack is rated to 10,000 kg (22,000 lb).


OIML certified with an accuracy tolerance of better than 0.2%


Built tough with quality materials for years of heavy industrial use. Dust and water proof with IP 64 ingress protection rating.


OIML R-76 MAA and OIML R-60 approvals. Certified 'legal for trade' in Europe, New Zealand, Australia, South Africa, Malaysia, and more.


Easy to learn and quick to use. Weigh grounded containers in under 5 minutes. Seamless data management with VGM App.

Links directly to VGM App

With BISON C-Jacks and the VGM App, you can:

  • instantly digitise the container weight
  • check the container's load distribution
  • capture photos
  • record essential shipment details
  • email a signed VGM certificate as soon as the container is weighed
  • keep detailed digital container weight records

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What do our customers say

Why NASA uses C-Jacks

Want to know more about C-Jacks?

" Scales Work like a charm"

- 835th Army Transportation Battalion - Okinawa, Japan


More reasons to choose C-Jacks

BISON C-Jacks equip you to weigh containers at the loading point - anytime before, during or immediately after the container is loaded.

Save money

Avoid 3rd-party truck scale charges. Many of our customers get a return on investment from their C-Jacks within months, just from avoiding weigh station fees. Find out how much your business could save in weighing fees with our free weighing calculator. 


Having an accurate gross weight before the container is transported puts your business in full compliance with the CTU Code, SOLAS VGM and Chain of Responsibility rules. In turn, you are contributing to the safety of the logistics chain.

Utilise your assets BETTER

By using inexpensive equipment to weigh containers, you don't need to detain expensive assets such as trucks, weighbridges, cranes and container handling equipment. Ultimately, this can result in savings and a return on investment for your business.


Control your container weights by aligning your weighing and loading operations. Get an accurate container tare before you load. Check the weight as you're loading. Get accurate gross and net container weights as soon as loading is completed. This removes reliance on third parties - such as transporters, weigh stations, ports and forwarders - and avoids the risk of errors, slow communications and delays after the container is dispatched.


Check and optimise your cargo as you pack the container. Weighing early allows you to maximise container space, lowering freight cost and avoiding the risk of being picked up overweight after the container ships. This is vital for cargo that is weight-sensitive or subject to strict weight limits during transit,  You can learn more about container load optimisation with our free e-book.

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