Take your pick... BCM, Daniels Defense, Yankee Hill... pretty much any name with a repute for quality will make a product which meets and exceeds your durability requirements. I tried looking, and I haven't really found anything which tested quad rail systems to the breaking point, but you really can't go wrong with anything from a quality manufacturer.
Gold is neither strong nor durable. It's heavy, soft, rare and non-corroding.Titanium and it's alloys, are the strongest.
The North Face Skareb 50 Backpack has light but durable parachute material which is why it is the strongest.
Titanium or tungsten are the most durable metals you can use in a ring.
Leather is considered to be the most durable material for luggage.
Assuming by strongest you mean most durable, maintenance free, and scratch resistant, then it is by far tungsten carbide.
Nokia
Diamond mineral is the hardest natural mineral on earth, which makes it the most durable of any mineral.
The most popular and durable childrens clothes is OSH Kosh, everyone remembers their little coverall jeans.
Sealy makes some great children's bedding that is both fairly priced and durable.
"Most" durable is a matter of opinion, but some popular brands that manufacture durable men's swimwear include Speedo, Nike, Quicksilver, Reebok, TYR, and Dolfin.
amazon
The most durable car has got to be the Toyota Hilux (not stripped out) I refer you to a programme called Top Gear who researched this. Check it out on youtube, its very entertaining. The most durable car has got to be either a Hummer or an old Volvo.