I'll add to this, as I've used a metric ton of OT stuff over the years, sometimes out of necessity (couldn't afford better), some out of choice just to see how it went.
I use 2 of the 30oz tumblers every day for coffee. I have forgotten about my cup, and come back 7 hours later and it was still hot enough to drink. Maybe not as hot as I prefer, but I'll take it. My wife has a few Yeti tumblers, and so far they seem pretty much the same.
I bought a Fieldline Tactical bag about 6 years ago, just to get something bigger for my Bug Out Bag, assuming I'd get a year out of it, fully planing on picking up a 5.11 or similar brand bag later. 6 years, tons of camping trips, dozens of hikes, and countless unloading and reloading and it's still in about the same shape as when I bought it (well aside from the holes my kid put in it with a filet knife).
I have a 4 man dome tent I bought for a music festival in 2000, used it in the back yard 2 years ago and it was still waterproof. Packs to the size of a coffee can too (plus poles) so if I do any back woods camping while hiking I can take that and tie it to my bag.
One of the best purchases of OT gear I've made is something I purposely tried to break for about 2 years. I bought a $4 folding lockback knife, with the express intention of torture testing it in real world conditions. I carry a knife and use it daily, so I figured I'd be a good one to test it. Then we went camping after it lasted 6 months. I was using that little knife and another piece of wood to chop logs. It just won't quit. I've abused it way beyond what I thought it would take. After 2 years I've moved on to other knives, but it earned a home in one of my survival bags, which I don't take lightly.
I'm sure there is more, in fact I know a fair portion of my first bug out kit was OT stuff. Bottom line, inexpensive doesn't always mean cheap.
Planning on grabbing one of the OT yeti-like coolers for our overland trip in June.