This will be dependant upon the environment the case is to be used within, the risk factors the case is exposed to and the fragility and sensitivity of the contents.
They would NOT be suitable, for example, for use in the hold of an aircraft or as a carrier transit solution without additional external packaging.
They do offer a degree of shower resistance/splash resistance but are not waterproof.
They are perfect, however, for storage and transit solutions for equipment on and to site locations or as sample presentation and demonstration cases.
Foam inserts offer further protection to contents by restricting movement of the contents and also provide the benefit of the contents being easily identifiable and well organised at the point of use or display ensuring maximum work efficiency whether the contents are working tools or equipment or product samples for sales presentation and demonstrations.