From the release:
Dragon Forge Design releases three new sets of Resin Cargo Containers.
Cast in durable Urethane Resin for use with 28-30mm figures and vehicles
Each set includes Six different size boxes per set.
The three different sized sets are as follows,
CONV-CBS-001 Set of Six Small Cargo Boxes Width 20mm, 6 for $5.00
CONV-CBM-001 Set of Six Medium Cargo Boxes Width 25mm, 6 for $6.00
CONV-CBL-001 Set of Six Large Cargo Boxes Width 30mm, 6 for $7.00
They are now for sale in the Dragon Forge Store.