Click Here To Visit The SRGC Main Site
I doubt if the box would be cheaper as it too would have to go through the card with the size categories (we have them here too). I'm just sticking to padded envelopes to be on the safe size. One thing, although I still have to pay for the postage, I never have to buy the padded thing now as I have so many accumulated here from seeds from other sources.
When sending an individual little packet of a few seeds i often do as Cohan suggests but with a modification. A single thickness of corrugated cardboard is thin enough to stay within the size limit for letter post. I cut a hole in the card, slightly smaller than the seed packet, then tape the packet across the hole before popping the thing into an envelope. Theory is that the post office machinery rollers would then gently push the seeds into this hole where it would be protected by the thickness of the surrounding card, rather than crush them. I have not tried posting seed to myself to see if it works...obviously the seeds need to be smaller than the thickness of the cardboard - no Paeonia!If this doesn't make sense I can post a picture later.
HiI use the small A/000 bubble type jiffy bags for mailing most seeds , small bulbs and bulbils without ever any problems. These are available on ebay at only a few pence each. Eric