ive been known to send bare roots just in a bagie in a box, just news paper is ok for bulbs n bareroots but there are better ways for live plants wrap roots in wet paper towl put in baggie or plastic wrap then wrap newspaper around it to cushion.
I like packing the box (if any unused space is left) with some of those packing peanuts. This keeps the plants from getting shifted around in transit. They don't weight anything so its like shipping air, but protects the plants.
i just learned a cheap good way to mail small plant or cuttings. if there under 130z you can ship as a parcel in a bubble envolope. make sure you put "parcel" or "handle with care" on it so it dont go through the mechine.
i stuck 6 small daff bulbs in a instant soup box, stuffed it in a bubble envoplope, it weighed 5.4 oz n woulda only costed me 2.02 to send! i have a scale so that helps. i think a bathroom scale would even work. i havent tried this yet but i want to lol any one ever did it? heres a link parcel prices scroll down parcel prices
I've sent mint cuttings and small plants in baggies with wet paper towels shoved into a paper towel tube-then wrapped in brown paper. You can get five or six baggies worth in there depending on the size. Never has cost more than 2.19 yet!