Dear Friends, I guess I am a professional when it comes to seed envelopes because I have purchased and used 10s of 1,000s as co chairman of the SIGNA Seed Exchange. Belive me not all envelopes are created equally. We use 1 3/4 x 2 3/4 in. glassine for its light weight (makes a big difference if you are sending or storing a lot of seeds), for its semi transparency, easy of use, ease of seal , low price, relative availability etc. Even all glassine envelopes are not equal. Some really cheap version have a zig-zag, ragged cut opening that makes handling of seed very difficult. Some packets open along the side, another problem. We have seen samples of envelopes from many suppliers. We use the same envelopes as NARGS and can recommend them. If you have any questions I'd be glad to give specifics. We used to use brown paper coin envelopes, but rejected them early on. As we did to small zip seal plastic packets. SO if you are serious seed about collecting, storing and sending seeds, glassine are the things to use. There are some seeds that have special needs that may not be suited to these standard seed envelopes, but not many. Best Jim W. -- Dr. James W. Waddick 8871 NW Brostrom Rd. Kansas City Missouri 64152-2711 USA Ph. 816-746-1949 Zone 5 Record low -23F Summer 100F +