Flat-rate vs weight-based international shipping

Vendor shipping costs are structured in two main ways and understanding the difference helps you evaluate whether a shipping charge is fair and what service class you are actually getting.

Flat-rate shipping

Most ID vendors charge a flat fee for standard international shipping — typically $10 to $20 — regardless of how many cards are in the order. This is a simplified model that works because ID cards are small and the weight difference between one and five cards is negligible in terms of actual postage cost. The flat fee covers the vendor's cost of packing, postage, and handling.

Flat-rate standard shipping at most vendors uses China Post ePacket or equivalent national postal services routed through standard international mail streams. The vendor pays actual postage based on weight and destination and the flat fee you pay may be above or below their actual cost depending on order size.

Weight-based express tiers

Express shipping at many vendors is priced by the service class rather than weight — DHL Express to the US is the same price whether the package weighs 50 grams or 200 grams, because DHL's pricing for small packages in this weight range is weight-insensitive. What you are paying for is the service class, not the gram weight.

What actually affects vendor shipping costs

For vendors shipping ID cards, the meaningful cost variable is destination country zone, service class (standard vs express), and whether the package requires any special handling. Size and weight within normal ID card quantities are irrelevant.

When you see a vendor charging dramatically different shipping rates for single vs bulk orders, that pricing is not driven by actual weight — it is either a way to capture margin on larger orders or a reflection of using a different carrier class for different order sizes. Ask the vendor which specific carrier and service class each shipping tier uses. This tells you more than the dollar amount does.