Hi Julie Marie, it would be best to check with your Post Office for weight and size restrictions as each country has different regulations. Also, it is usually less expensive to send smaller parcels rather than one large one.
There are many helpful tips for packaging and mailing found in the 'Helpful Hints' [top toolbar.] Please read the discussions: Postage Information and Packing Slip and Mailing Label. If you have other questions, please ask by posting them in the "Questions, Answers and Help" discussion, listed in the Helpful Hints :-)