This travel safety tip has recently gained attention because it’s a simple yet effective way to check for hidden dangerswhen staying in unfamiliar accommodations.

When you throw a bottle of water under the bed upon checking into a hotel or motel, the goal is to ensure that nothing—and no one—is hiding underneath. If the bottle rolls out freely, the space is clear. But if it stops abruptly or fails to emerge, it could mean there’s an obstruction or even a person hidden beneath the bed.

Flight attendant Esther from KLM Airlines shared this precaution based on her professional experience, emphasizing that travelers should always inspect their rooms thoroughly—including less obvious places like under the bed, inside closets, and behind curtains—to ensure personal safety before settling in.