All About Shipping Containers-  
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Specifications
The common  types of ISO shipping containers are:
 - 20' GP  (standard type)
 - 40' GP  (standard type)
 - 20' HQ  (meaning High Cube. It is 1 foot taller than a standard 20' GP)
 - 40' HQ  (meaning High Cube. It  is 1 foot taller than a standard 40' GP)

 - Open top       (not commonly used for construction)
 - Open side    (not commonly used for construction)
 - Freezer, or Refrigerated (not recommended for ISBU home construction)

                                  LxWxH                                   LxWxH                               Weight                           
         20 GP   20-0 x 8-0 x 8-6 External, 19.4 x 7-8 x 7-10 Internal,   6,460 lbs.     Details... 
         40 GP   40-0 x 8-0 x 8-6 External, 39.6 x 7-8 x 7-10 Internal,   8,300 lbs.     Details... 
         40 HQ   40-0 x 8-0 x 9-6 External, 39.6 x 7-8 x 7-10 Internal,   8,600 lbs.     Details... 


                              


20 HQ units are manufactured but not commonly available unless ordered direct from the factory .

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               Below are  photos of 50 types of specialty ISO Shipping Containers used globally.