I think you can get 140 in there. A chip box with 100, then roll 40 up in a long stack, roll with plastic wrap, then a little bubble wrap. Fits inside a SFRB. But I don't feel that's safe, so best to drop the SFRB inside a flat rate padded envelope or better yet, two flat rate padded envelopes. Pretty much same price as SFRB.
I have shipped 200 chips the same way before, basically putting 2 chip boxes "inside" a SFRB...it "busts" out one side of the box, and in this case, the bubble mailers are required. It can be done. It's not optimal. I feel great with 140...not great with any more than that.
Great chips Bill, someone should buy them.