@sustainableitad wrote:
My question is how to avoid this situation in the future. How do I make a listing so that the shipping charge for multiple items is correct?
You've figured out the hard way, you cannot account for different package sizes based on quantity purchased when you offer combined shipping by weight.
I notice you are charging online discounted rates to buyers. This is part of the problem. Since eBay launched cubic rates, which is calculated on package size, offering online discounts means you'll be undercharging buyers when box size increases.
Ways to avoid this:
1. Charge buyers retail rates. You could also set a % off retail discount. As long as you charge online discounted rates you are losing money on every single package, regardless of size, because you pay fees on that ship cost.
2. Keep charging discounted rates but add a handling fee to cover the losses.
3. Keep charging discounted rates but change your box size on every listing to 12x12x12 to avoid charging buyers cubic rates. This will really screw up ship costs for international buyers if you use eBay International Shipping so I don't suggest it if you plan to ship internationally.
4. On your buyer management page, restrict the number of items a buyer can purchase in a 10 day period. I don't suggest this as you'd be limiting sales for something you can control in other ways.
Control carrier discounts on this page:
https://www.ebay.com/ship/prf
