1st class mail to australia refers to the option of sending packages via USPS First-Class Mail to Australia, which is an economical shipping method for small, lightweight items. First-Class Mail offers affordable rates and delivery within a reasonable time frame, usually ranging from 7 to 20 business days. For e-commerce businesses shipping to Australia, First-Class Mail is a viable option for international deliveries, helping to keep shipping costs low while still providing a reliable service.