Our customer required individual wooden box package for each valve. The packing cost will be very expensive because there are many different sizes with small quantity.

We evaluate unit weight of each valve, found they can be loaded in carton, so we suggested change to separate carton package to save cost for customer. 
However it was also hard to find carton factory to do small batch of cartons. We communicate with several factories for a long time, finally found a solution through a partner who is a big client of carton factory. 
Customer was impressed and enhanced the cooperation with us since then