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The answer to the riddle "Nobody empties me, but I never stay full for long. What am I?" is a tissue box.
1. The context clue "Nobody empties me" suggests that the object doesn't get emptied like a trash can or a jar.
2. The clue "I never stay full for long" indicates that the object gets used up quickly, which aligns with how tissues are used and the box doesn't remain full for an extended period.
3. Tissue boxes are commonly found in homes or offices, and people frequently use tissues for various purposes, supporting the idea that a tissue box fits the description in the riddle.
Therefore, based on the context clues provided and the characteristics of a tissue box, it is the correct answer to the riddle.