To prepare your Rosaries for shipping, certain methods
should be followed to ensure your package arrives safely.
For our apostolate work we bundle our Cord Rosaries
into groups of 5, then rubber band the Crucifixes together,
and use a twist-tie at the other end.
You can try bundling 10 together, but that's a little tricky.
You don't have to twist tie the other end, but it helps to keep the Rosaries from tangling together. And it makes it easy for your recipient to open and distribute the Rosaries.
Each Rosary may also be individually packaged
in a plastic bag.
For Chain Rosaries, we put each in its own bag. But you could also rubber band them the same way as the others.
Small quantities of little zip bags are available at big stores, like Walmart, in the craft & sewing section.
We use a reliable supplier: U-LINE for our zip bags. We use brand name bubble shipping envelopes, sold HERE. We re-use all the Boxes that our own Supplies come in. Be sure to use a sturdy box for overseas shipping If you will be shipping Rosaries out of the country, A shipment under 4 pounds uses the green & white form, You'll be required to provide your Name, Signature, Address and list the Contents. List the Value at Zero We list the contents as "Religious Items." Listing "rosaries" or "scapulars" as the contents If you are shipping to a non-Christian country and making your own shipping label, leave off any religious images, For the same reasons: Never Mail Blessed Rosaries! Or any other blessed article. Insurance and delivery confirmation are all up to you We rely on the Guardian Angels 
We found Jiffy-lite are the lightest so you won't have to pay more for a heavier weight envelope.
"Bubble" envelopes are an ounce lighter than "Padded."
Size 8.5 x 11" will securely package 50 Cord Rosaries.
Anything to save a penny!
of more than 4 pounds weight.
Otherwise, a bubble envelope works just fine. 
you must fill out a Customs Form at the Post Office.
over 4 pounds uses the larger white form.
50 Cord Rosaries weigh just under 4 pounds.
Check Mark the "Gift" Box
"No Commercial Value"
Listing greater value will cost your recipient Customs Fees!
may prove dangerous for your Recipient
if his Country or Culture does not take kindly to Christians.
such as your company or mission logo, etc.
This also can cause trouble for your recipient, or your package may get "lost" or be destroyed by anti-Christian handlers, or will fall into the wrong hands. 
Include a little note with your package indicating the
Rosaries have not yet been blessed by a priest.
- everything costs money.
as our insurance and delivery confirmation!