The 50's weigh 13.32g each, round to 15g each to cover packaging. Below I hope isn't too out of date but I will wear it if so. - Flat Rate Satchel (500g): $5.50 ($1.00 extra if you require signature) - Flat Rate Satchel (3kg): $9.35 ($1.00 extra if you require signature) - Express Satchel (500g): $9.20 All options have tracking number.