I purchased these when I bought the eBags hard case spinner. I had never used them before but now will be using them all the time. I bought the  24" suitcase and by using the packing cubes I was able to pack clothing for a 3 week trip to Japan. I packed 3 pairs of Jeans, 1 Capri pant, 4 pairs of shorts, 9 shirts, 4 pairs of shoes and a trench/raincoat!  Plus my toiletries!  I was truly amazed. The suitcase only weighed 41.5 pounds - well underneath the weight limit for international travel. These cubes have changed the way I travel. I travel extensively for work and usual length of stay is 5-14 days. With this new system, I will pack more efficiently and never worry about my suitcase being over the weight limit or not have enough clothing to cover my stay.  I will be buying more for my shoes.  I truly recommend!