I've sold USPS Med. Flat Rate boxes FULL several times. I can get about 115-120 in one but with a little
packing to help them, I'd say 100 easy. They were loose and not in sleeves or boxes.

You have any Wilson C:25's or the old 3 piece Wilson Zip balls (newer ones are 2 piece)?

Speaking of USPS flat rate boxes, I have combined them before and they were accepted by my carrier. I had 2 used flat rate boxes and the item I was shipping was odd shaped so I cut and taped the two boxes into a weird one that covered the item, and then printed the flat rate label at home. I think the trick here is to give it to your carrier and DON'T go to the Post Office. The anal-retentive-non-customer-service-rule-bound desk clerks will turn you away. At least that has been my experience.

I have even printed flat-rate labels at home and taped them to similar sized regular brown boxes and they've been accepted........by giving them to my carrier.

    sdandrea1

    sdandrea1 Speaking of USPS flat rate boxes, I have combined them before and they were accepted by my carrier. I had 2 used flat rate boxes and the item I was shipping was odd shaped so I cut and taped the two boxes into a weird one that covered the item,

    Was the double headed dildo u sent out a few years back?😜

          I once crammed a full set of iron heads into a small flat rate box. It was very heavy. I dropped it in an empty drop off box and it sounded like a sonic boom when it hit bottom. I later read somewhere that anything over 13oz. in a small flat rate box should be taken to the PO counter. Not sure what the diff is but my package made it to destination.

          Grabbed a couple medium flat rate boxes. $13.60 to ship and I'll go by Eguller's 100-120 balls depending on sleeves/no sleeves.

          Hmmm...time to start figuring.