I have a Cart 15 bag that is a couple seasons old and have not experienced any of the issues that you mentioned.
Mine is all black, and I bring it indoors after golf so it really looks almost in new condition.


I do know that some colors would fade if left in direct sunlight for long periods of time, but I have not experienced that either.

I have used a Cart 15 for 150+ rounds on a Sun Mountain cart with no problems and highly recommend it.

I read the reviews. There were only six reviews on the bag. One was very satisfied. Three complaints were out of warranty, one at 2.5 years and another at 4 years. Another had issue with color fading and need to be careful when choosing colors. Red or bright colors will fade in the sun in the south, regardless of manufacturer. I have a cart 14 bag and have had it over five years, all black, no issues. Difference, pretty much one more slot. How you care for your bag makes a difference. Throwing it around in the trunk can damage the zippers and the stitching. Leaving it in the sun and heat in a trunk, if wet, can make the stitching age quickly and potentially break. Proper care can lengthen the age of any bag.