Bungee cords and tie-down straps are not the same.
Bungee cords, also known as shock cords, are designed to absorb shock and are great for holding down a tarp or securing the cover on a cooler; but not for containing heavy, bulky, or airborne-prone items.
Tie-down straps, however, are specifically designed to secure cargo for transportation. They are available in a variety of lengths, widths, strength ratings, hook ends, and securing methods.