CaneDog
eXtreme
If someone is requiring a SASBE that's a specific request, but FWIW, here's how I typically ship seeds safely and at a low cost.
I cut a piece of printer paper and a piece of thin bubble wrap to the size of the envelope - in the picture below, I recycled bubble paper from a Baker Creek seed-shipping envelope. I staple the seed baggies to the printer paper, spaced evenly in 2 - 3 rows depending on envelope size and number of packets. This keeps the seed baggies from clumping up, so the envelope stays thinner. Then I sandwich them between the printer paper and the bubble paper.
Once the envelop is sealed, I place it under a massive dictionary I've had forever with some additional weight on top. After leaving it that way for a little while for the materials to compress, it's time to ship. I use only basic postage (a USPS domestic ($0.63) or global ($1.45) forever stamp) and drop them in the box. I've never had an envelope returned/flagged for additional postage when I've dropped it into a mailbox, though once when I handed one to the employee at the post office counter they put it through the measuring tool and made me pay extra.
I've sent over 10 packs in a 6.75" envelope and over 20 in a full-size letter envelope, but how many seems reasonable depends on the number of seeds in the packets. Generally, I try not to push it quite that far as I don't want to risk an issue.
I cut a piece of printer paper and a piece of thin bubble wrap to the size of the envelope - in the picture below, I recycled bubble paper from a Baker Creek seed-shipping envelope. I staple the seed baggies to the printer paper, spaced evenly in 2 - 3 rows depending on envelope size and number of packets. This keeps the seed baggies from clumping up, so the envelope stays thinner. Then I sandwich them between the printer paper and the bubble paper.
Once the envelop is sealed, I place it under a massive dictionary I've had forever with some additional weight on top. After leaving it that way for a little while for the materials to compress, it's time to ship. I use only basic postage (a USPS domestic ($0.63) or global ($1.45) forever stamp) and drop them in the box. I've never had an envelope returned/flagged for additional postage when I've dropped it into a mailbox, though once when I handed one to the employee at the post office counter they put it through the measuring tool and made me pay extra.
I've sent over 10 packs in a 6.75" envelope and over 20 in a full-size letter envelope, but how many seems reasonable depends on the number of seeds in the packets. Generally, I try not to push it quite that far as I don't want to risk an issue.