What is the smallest thing you can mail?

Understanding the Minimum Size Requirements for Mail

The postal service is designed to handle a wide range of mail items, but it has certain limitations when it comes to size. While small items like letters and postcards can be mailed without issue, there are minimum thickness requirements that must be met for proper handling and processing.

Minimum Thickness Regulations

Postal regulations stipulate a minimum thickness of 0.007 inches (0.18 millimeters) for all mail items except for keys and similar thin, flexible objects. This thickness ensures that mail pieces can withstand the sorting and delivery processes without being damaged or lost.

Exceptions for Thin Objects

Keys and other extremely thin objects are an exception to the minimum thickness rule. They may be mailed in envelopes or protective sleeves that meet the minimum size requirements (3.5 x 5 inches), provided that they are sufficiently rigid to avoid bending or tearing.

Consequences of Violating Size Requirements

Mail items that do not meet the minimum size requirements may be returned to the sender or discarded. In addition, postage may not be accepted for such items, resulting in delays or additional charges.

Implications for Mailing Small Items

When mailing small items, it is essential to ensure that they meet the minimum thickness requirements. If the item is too thin, it is advisable to use a thicker envelope or protective sleeve to prevent issues with processing and delivery.

Conclusion

The postal service has established minimum size requirements for mail items to ensure efficient and reliable handling. While exceptions exist for thin objects like keys, the vast majority of mail pieces must meet a thickness of at least 0.007 inches. By adhering to these regulations, senders can ensure that their mail is delivered safely and on time.