Most here know what I am about to say in this paragraph. Dell has more experience shipping fleshy seed and small bulbs than most of us. He often uses small cardboard boxes. Inside he uses foam peanuts and paper for cushioning. For hard dry seed Dell uses padded envelopes. In the past I have put fleshy seed in small (non-food) plastic zip bags cushioned with perlite, then put them into padded envelopes. It doesn't always work. So if the seeds are valuable, I would suggest using the small cardboard boxes. They cost about $2-$3 US to mail. By the way, Dell has remarked in the past that it would be nice if people returned the mailing envelopes and boxes to him for re-use. Leo