We've been using these for several years.  They're outstanding for packing.  We keep buying more and we still find more uses for them.  Got them in my backpack, on the boat, in the gym bag, plus a big stack reserved for packing luggage.  We're hooked on them.  We've got my mother-in-law hooked on them.  Buy the bright colors.  They're easier to see when lying around a hotel room.  I have (3) smalls in my briefcase with each of them being a different color so I can easily tell what's in it.