Coins and precious items such as jewelry need to be stored and mailed properly to ensure they are not damaged. The best solution is to keep them inside #7 coin envelopes and take them out when necessary. These envelopes have flaps on the shorter side to ensure easy insertion and retrieval of the small items stored inside. This particular #7 brown coin envelope is made from brown Kraft paper. These high-fiber 28 lbs or 104 gsm brown Kraft paper greatly adds to the durability of these envelopes. The flaps of the envelopes can be sealed by applying moisture and pressure.