noncrushable

/nɑnˈkrʌʃəbəl/
adjective
  1. Not able to be crushed, flattened, or damaged by pressure.
    • The helmet is made of a noncrushable material that protects the head.
    • The shipping company uses noncrushable boxes for fragile items.
    • This noncrushable water bottle can survive being dropped from a cliff.