Due to an accident involving a UPS truck, we will be shipping 450R and YFZ frames back in boxes from this point forward. We have in the past used foam/bubble wrap and a final shrink wrapping to secure the frames. This has been fine for over 400 frames but seeing what can happen if the unthinkable occurs, we are making the change. It will add $5 to the cost of a frame but the piece of mind is well worth it.
I hope the 400ex/Z400 etc frames will also work in the large boxes i have ordered, but i wont be able to know until they arrive.