This is actually my second time getting these packing cubes. My first time they were gifted to me from a family member before a big international trip that I took. I didn't initially think they'd be useful but they are so amazing and I won't travel without them! The different sizes are great for multiple items - the smaller one is great for socks and undergarments. The larger one is great to pack empty and to store dirty clothes in as your trip progresses. You can even fit shoes in them so they don't get your clothes dirty in the suitcase. They really help to organize your suitcase while traveling. After a few trips sharing one pack between my husband and myself, I bought this one for him so we wouldn't have to share anymore. This is the quintisential travel item that everyone should own!