You need to revise your weight and dimension details to comply with the chosen shipping method.
Solution
Visit the Etsy dedicated page to understand the requirements for each shipping service.
Please note that:
The maximum weight allowed is 70 lbs, with a limit of 16 oz for USPS First Class Package Service and 4 lbs for USPS First Class International Package Service.
The length should be the largest dimension.
Choose a shipping option that is suitable for your item’s weight and dimensions.
If you have a product that doesn’t comply with the shipping service requirements, please, do the following: