The package size must be less than 45" (longest side) x 20" (second longest side). 2, Mercari is raising shipping fees on February 1, 2022, for certain weights, and buyers and sellers are saying it's pricing the ecommerce platform right of the market. They gave me credit for it. Shipping carriers tend to charge postage due fees to deliver packages that are over the weight and/or dimension limits on the shipping label. You can find more information about shipping in this help page on Mercari.com. If the prepaid shipping label is insufficient based upon the packages weight and size then: (i) the package may be returned to the seller or (ii) oversize or overweight fees will be charged and the additional fees deducted from your sales. For heavy shipments using a Mercari prepaid label, make sure that your package is under 50 lbs in both actual weight and dim weight. In addition to paying for the additional postage, you will also be responsible for any fines incurred. Non related comment: I kind of wish we could find out who the downvoting troll in this sub is Yeah Ive noticed that people just get downvoted for no reason. //]]>-->,