A stasis box was a small device with a control panel which generated a stasis field which would protect perishable items.
In the year 2372, Sean Hawk discovered a stasis box amongst Linda Addison's quarters aboard the USS Enterprise-E, and found that the box contained a sample of Addison's blood, proving that she had been replaced by a Changeling infiltrator. (TNG eBook: A Sea of Troubles)
A different type of stasis box was used by the ancient Slaver civilization. The box kept items preserved in temporal stasis, where not even time could get to the items inside. These boxes also had the ability to glow when it was near another box, even if it was a few light-years away. (TOS novel: From History's Shadow; TAS episode: "The Slaver Weapon")