What You Can't Send Without Getting In Trouble:
The day-to-day concern with accepting parcels is that they must be packaged well enough to protect their contents and strong enough to prevent the package from breaking and causing injury to employees or damage to other mail. Most people send normal items: documents, clothing, toys, etc. There are times when questions might arise about what can be sent and how.
Many of the types of items listed below are simply non-mailable, period. However, if an item is an ORM-D (Other Regulated Material- Domestic) this signifies that it poses a limited hazard because of its quantity and packaging. ORM-D materials are given the shipping name “Consumer Commodity” and may be mailed domestically but in extremely limited quantities and with special approval, labeling and packaging.