Super Strong when assembled with over 400 sq.inches of hook and loop fasteners at the corners. The Collapsing feature makes it great for tours. The Crate Works Transport systems PRO XL-C Bike Travel Case has been as far as New Zealand, Tibet and Outer Mongolia with no reports of mishap to box or bike (see our reviews!) . The PRO XL-C bike shipping box is Shipped complete with all Straps and Foam needed to pack your bike. All parts replaceable thru this website. The PRO XL-C Will last for many years, just ask the many Triathletes including one who toured for 3 years with his box all over the world.