I purchased these bags because I wanted two medium sized bags. I cannot compress the large bags very well for my clothes while traveling. I wanted to have several mediums for my suitcase. Also, I'm not sure how durable these will be compared to the other type I have that are quilted plastic and appear to be tougher.
  I'll keep them and use larger ones to use as dry storage at home but I'm not happy. It's not worth the trouble to return them. I'm glad I ordered 3 sets, even though I expected 6 MEDIUM, not 3 LARGE and 3 MEDIUM. I just hope they hold up well!