Pallet is a transportation packing. The usage of pallets helps to save loading\ unloading time owing to mechanisation of the process and considerably decreases damage losses.
The most popular are wooden pallets of two sizes:
1 Euro pallet - 800 x 1200 (mm)
2 Standard pallet - 1000 x 1200 (mm)
9 standard pallets (1000 х 1200) in a 20-foot container.
10 standard pallets (1000 х 1200) in a 20-foot container.
11 Euro pallets (800 х 1200) in a 20-foot container.
22 standard pallets (1000 х 1200) in a 40-foot container.
25 Europallets (800 х 1200) in a 40-foot container.
24 standard pallets (1000 х 1200) in a 40-foot container.
30 Europallets (1000 х 1200) in a 40-foot container.
27 Europallets (800 х 1200) in a 45-foot container.
26 standard pallets (1000 х 1200) in a 40-foot container.
33 Europallets (800 х 1200) in a 45-foot container.
Other types of containers and their internal dimensions you may find here.