That’s a heavy-duty rubber bucket with a metal handle
What it’s used for:
This type is called a "flexible rubber bucket" or "mortar/tar bucket". It’s built for rough construction work, not just carrying water.
Common uses:
1. Construction - Mixing and carrying cement, mortar, plaster, grout, tar/asphalt
2. Roofing & Waterproofing - Holding hot bitumen, Denso primer, or other sealants. The rubber won’t crack with heat like plastic
3. Industrial/Chemicals - Resists oils, solvents, and rough handling better than normal plastic buckets
4. General site work - Carrying tools, debris, water, concrete. The flexible rubber means if you drop it, it bounces instead of breaking
5. Cold weather - Rubber stays flexible and won’t become brittle