I'm like you regarding my purchases, but thinking about what will hold 'for life' is extremely hard.
Before reading about your last purchase, 'My bag!' popped up in my head. Osprey Farpoint 40. It's been 4 years and it is still holding great through many travel adventures, be it accross the USA, Iceland, or South-East Asia. It's the perfect size (cabin size) for travelling, and can hold everything I need for 1 week, 1 month, or even 6 months (I pack that lightly, yes!) and it's incredibly robust. I don't think I will have any problem keeping it another 10 years.
Besides that, I can't really think of anything. My phone usually last 4 years (currently Galaxy S7, still working perfectly fine after two years), my computer is starting to have a hard time (5 years, Sony Vaio, will probably buy a Dell XPS in the next year), but these are not buy-it-for-life item.