My scrappy pieces are probably 4 inches or smaller and will include nothing smaller than you could make a 2 inch block from. I will TRY to include at least half of envelope with 4 inch pieces. I have a variety of scraps since I get scraps from other quilters. Can't describe type since I have such a variety. I like the idea of the flat rate envvelope stuffed full. I will iron all mine so they will fit in better and I think I will be able to get more in. Looking forward to trading with someone else. One disclaimer...with holidays still here, could my partner not be disappointed if I don't get it mailed until after Christmas, especially since I will need to look through and then iron?