What Is Flat Rate Shipping?

Flat rate shipping lets you pay one fixed price based on the packaging you use, not the weight or distance (within the U.S.).

When creating a label, flat rate options will appear automatically. You do not need to enter dimensions because the system already uses the standard flat rate sizes.

Since weight does not affect the price, only a From ZIP code and a To ZIP code are needed to generate the rate.

Read more about the individual options below including common uses and sizes.

Flat Rate Boxes

Flat rate boxes are best for:

• Heavier items
• Small but dense products
• Bulkier shipments

Small Flat Rate Box (roughly 12 X 12 X 6)

This very small box is a flat, side-loading, rectangular box roughly the size of three DVD cases stacked. You can use this for jewelry, electronics, or other small items that need to be shipped quickly.

Medium Flat Rate Box 1 (roughly 11 X 8 X 6)

This medium size box is sized perfect for model cars, shoes, and taller items. The package folds into a tall, top-loading, rectangular box.

Medium Flat Rate Box 2 (roughly 12 X 3 X 14)

This medium tall, side-loading, rectangular box is perfect for garments, board games, books, and other thinner items.

Large Flat Rate Box (roughly 12 X 12 X 6)

The large flat, top-loading, rectangular box is good for large and/or heavier items such as books or clothing.

Large Flat Rate Board Game Box (roughly 11 X 3 X 23)

This large, tall, side-loading, rectangular box can fit two average-sized board games. This packaging is ideal for thinner and/or heavier items.

Standard Flat Rate Envelopes

Flat rate envelopes are best for:

• Document
• Jewellery
• Small, flat items

Standard Flat Rate Envelope  (roughly 12 x 9)

This envelope is ideal for documents, invoices, and thin items like small accessories or jewellery.

Legal Flat Rate Envelope            (roughly 15 X 9)

This envelope is best for legal-sized documents, contracts, and larger paper materials that need to remain flat.

Padded Flat Rate Envelope             (roughly 9 X 12)

This padded envelope is great for small fragile items like jewellery, cosmetics, or small electronics that need extra protection.

Envelope Guidelines

• Items must fit flat and the envelope must seal normally
• No overstuffing or bulging
• Same price regardless of weight (within limits)

Quick Tip

Always compare flat rate vs regular shipping before purchasing a label to make sure you’re getting the best rate.