Elastic is one of those things that you never know if the quality is any good until years later. Over a decade ago I bought one pair of Ex Officio (brand name) undies. Decided I liked them for travel, even though they were quite expensive, bought several more pair. Each one cost more than a bundle of cheap ones, so it was an investment. Only used them for travel, so minimal use. Less than a decade later, one of them was as good as new, the rest all had bad elastic. It is a roll of the dice. Not buying anything else from that brand.

A couple weeks ago I rode my errand bike to the gym, rear tube had only been ridden on a few times. Came out of the gym, rear tire was flat. I do not carry a spare tube on that bike, only used for short distances. So walked the bike a couple miles home. Pulled out the tube and there was a thin area in the rubber, the tube had an 8 inch long tear along that thin spot. It is a roll of the dice. That is why I always have carried two spare tubes on a bike tour. Two years ago I did a bike tour with a former co-worker, he had a tube blow out, similar problem. Fortunately he had another tube and never needed it on that tour.