Completely new to ebay so please excuse me if this question is dumb. I would like to sell some bags on ebay. But unsure of how to do the shipping. I know there is a shipping calculator that can be used but it needs the weight of the item. Just curious as to how others do this? Do you guess the weight or do you actually weigh it? What do you use to weigh it? Also is there any other advice for a newbie seller? TIA