Kitchenaid Refrigerator - Unless it's a lemon, any refrigerator should last at least 10 years. Although all are at risk for the coolant leaking, but all can be repaired. I don't really see what would set a "BIFL" fridge apart.
Nalgene - I had a few Nalgenes that I thought would last forever, then the harm of BPA was discovered. I'm now wary of any water bottle made of plastic. I've got a stainless canteen, but I still don't consider this "for life" as they can get dented, you might need to buy more for trips etc.
Socks - No matter how sturdy they look when new, eventually they're going to end up worn through. Buy yourself nice socks, especially for hiking. But they're a wear item, not capital equipment.