Elements' Waterproof Laptop Bag for Apple 17" MacBook Pro is made from an advanced PVC-free fabric that is 100% waterproof and gasproof, has excellent abrasion resistance, won't become stiff in freezing temperatures, and won't give off fumes in extreme heat. It's also more environmentally friendly than more commonly used PVC fabrics. It features a 100% waterproof Tizip for closure and patented purge valve technology. When used properly, this bag would protect a laptop even when fully submerged in salt water for days. No compromises were made in materials and construction of this bag.