@jackthebearThank you. Yes that does help. Maybe I don't understand 100% yet, but if not 100% I'm close to it now. The key would be to put however many items in a bundle as a seller and check the weight first so you make sure you the shipping won't cost more than the standard and offer the buyer a bundle price, with the appropriate poshamrk shipping cost.
Can the buyer make a bundle and do a purchase on their own? Or do they need to wait for me to calculate some shipping or does it come over as an offer even if it's full price for each item? (probably wouldn't be!)
That's interesting about if there is a return wanted for one item in a bundle they all have to go back. I do find their return/issue policy weirdly rigid. Meaning you can't offer a little rebate to someone for a problem that comes up - Only offers two choices: keep or return.