The cylindrical protective containers meet all the requirements of the P 650 Packaging Regulations for secondary packaging. They are designed to withstand, without leakage, an internal pressure difference of at least 95 kPa (0.95 bar). All protective containers have absorbent linings. The rectangular mailing bottles are watertight and are ideally suited for the transportation of, among many other specimen types, swabs. All mailing bottles have absorbent linings.