Another note about the flat rate envelopes. I joined a swap where we made 6 blocks of one designs and you could make 4 sets. that meant I had 24 blocks done. There are some that allow 6 sets so you would have 36. Al these blocks fit in the flat rate envelop for the $5.60 price. It makes a very stuffed envelop. Also they were in one big plastic baggie. All went fine. So even when the blocks are finished and weigh more, it will still fit in a flat rate envelop without extra postage. Actually, thinking about it....this is less expensive then sending them individually. My darn post office wants to now charge me $2.10 per envelop because she says it is considered a package and not a letter. So I will save money doing it this new way. Anyone who has participated on the monthly blocks knows the thrill of getting a big envelop with lots of blocks.