There's been a similar thread on another forum about Chain Reaction and packaging ... here's my contribution :
I think you'll find that a lot of the packaging "decisions" that most of the mail order outfits make are dictated by the delivery service .. standard sizes of carton that can be transported, handled, sorted with more automation etc mean lower charges per package ... that's certainly the case with Amazon.
The delivery service is also probably related to cost too .... don't forget that most big mail order suppliers will have a fixed (or small range) price for ANY package ... and that bears no relation to Royal Mail or other carriers' published charges. Doubtless CRC, and the others, have such a deal - the difference in cost/handling for the carton makes sense for them.
(I recall that the software supplier from days of yore, jungle.com (remember them?) had a fixed price delivery cost of about 30p from Royal Mail ... the "street price" being, then, over £1)
Rob
BTW - I'm expecting some CR2032 batteries from Amazon for a couple of bike computers ... I'm just hoping they can get the truck into our road