Parcel Post is the worst selection or shipping method for Breakables! As explained to me by Postal Authorities; Parcel Post items are "dumped" in a large container which is then filled up with Heavy Packages loaded on top of each other. The Parcel Post items are not handled with the same amount of care that Priority Mail items get.  

I personally, have had numerous items arrive broken each time the seller shipped via Parcel Post and NO breakage with Priority Mail.

It's just not worth shipping Breakables via Parcel Post and most experienced sellers will only ship Priority for these very reasons. The small savings you get with Parcel Post doesn't justify the risk of ultimate damage, whether insured or not! "Penny wise, Pound foolish"

*P.S. United Parcel Service/UPS...gives ebay sellers a terrific Discount if you sign up with them through paypal! They have very specific shipping requirements on shipping China, Glass etc. - Double Boxing for breakables, 2 inches of cushioning and all items must be Bubblewrapped. If not packaged accordingly, breakage claims can be denied.

Hope this info helps you!