Dry Containers
  Internal Dimensions Capacity & Payload Door Opening Dimensions
  L W H Cu P W H
20' 5898 2352 2393 33.2 21740/28230# 2340 2280
40' 12032 2352 2393 67.7 26630 2340 2280
HC 12032 2352 2698 76.3 26520 2340 2585

Reefer Containers
  Internal Dimensions Capacity & Payload
  L W H Cu P
20' 5444 2284 2267 28.5 21135/27160#
40' 11583 2284 2250 58.7 26580
HC 11583 2286 2556 67.9 26380

Open Top Containers
  Internal Dimensions Capacity & Payload
  L W P Cu P
20' 5900 2330 2337 32.6 21740
40' 12025 2330 2337 65.8 26410

Flat Rack Containers
  Internal Dimensions Capacity & Payload
  L W H Cu P
20' 5628 2178 2159 / 27800
40' 11762 2178 1986 / 40250

Meaning of the first or the first two digits of container serial number
  Dry Containers Reefer Containers Open Top Containers Flat Rack Containers
20' 0 3 5 22 23 25 26 52 92
40' 1 4 6 7   20 21 24 27 54 94
HC 96 8       29 / /

Remark: The dimension is in MM. Capacity is M3.Weight in Kg. The red load line on the reefer interior side wall marked the permitted height for cargo.