Seashells are generally allowed into the U.S. if they are not taken from endangered or threatened species (CITES protected), and they are completely sanitized from the creatures that inhabited them, and any other agricultural material such as sand, clay, soil, etc. A traveler may bring in a reasonable amount of seashells for personal use as a memento of their trip. Large quantities of seashells being brought into the U.S. for the purposes of using them in crafting, landscaping, or for commercial use are prohibited.