The best way to pack items is to put them in a carton with regular, cuboid shapes. The proper arrangement of items and securing them against free movement, no additional marks on the carton (eg. caution - glass!, top / bottom, etc.) and the lack of stretch film on the outside of the packet make your shipment meets the standard requirements. It is the most popular type of shipment and also the cheapest.
Detailed rules and conditions for packaging shipments are specified by Couriers.
They are detailed described at the Couriers websites (links below).
- CORREOS EXPRESS: https://www.correosexpress.pt/SeguimientoSinCpPt/faq
- CTT: https://www.ctt.pt/application/themes/pdfs/manual-acondicionar-envios.pdf
- DPD: https://dpd.pt/apoio-ao-cliente/condicoes-gerais-de-transporte-internacional-terrestre
- FEDEX: http://www.fedex.com/pt_english/services/terms/
- TNT: https://www.tnt.com/express/pt_pt/site/how-to/pack-shipment.html
- UPS: https://www.ups.com/pt/pt/help-center/packaging-and-supplies.page
