Ray,
Check out the use of "lift vans" - they are wooden boxes which fit exactly into containers so you simply pack the number you need to make up the shipment. You can then easily share a container. Lift vans can be delivered to your house to pack, then sealed and shipped and delivered without opening.
If you pack yourself you will only be insured against total loss, damage etc is not covered. If the shipper packs it you can get complete coverage.
Cheers