Hard-sided luggage is generally made using an injection moulding process for plastic and have the added security feature of combination locks but are heavy before you start packing. Soft-sided cases are usually made of fabric with partial frames and reinforcing plates where needed. If the fabric is advertised as “ballistic,” it means that it is woven in a similar manner to bullet-proof vests. Make sure your soft-sided luggage is waterproof or water-repellent.