Thanks for your reply.
Look, I am based in Australia but so far I haven't heard much about fullfiment company in Australia. On the other hand, it is a sort of service very popular and wide available in the USA. I could mention a few companies based in the USA(shipwire for example) which offer such kind of service with a great variety of package for online sellers. But in Australia, I don't know. Actually I know a few, basically through searching on Google, but again, I have no reference and I know nobody using their services.
At the moment, I still can handle packing and shipping for my sold products.
But I am planning to possibly outsource the storage, packing and sending in the future. I think the time saving involved in these tasks might worth it.
I was just curious to know if some Aussie in the forum is using such service in Australia and if could possibly recommend it or discuss the experience about that.