Parcels that exceed 2 cubic feet (3456 cubic inches), add $25.00.

That being said, my first thought is a box around the size of the small flat rate USPS box. I dont have any of the padded flat rate envelopes handy at the moment. The USPS has a set rate for items up to 1 pound, and flat rate envelopes and. Please Note: This product ships in packs of 10 envelopes.

Maximum weight for Medium and Large Priority Mail International Flat Rate Boxes is 20 lbs.

Parcels that exceed 30 inches in length, add $15.00. I assume youre talking about boxing an item to protect it, then putting it in in flat rate envelope because it would be cheaper than just mailing the box as-is. If the item that is being sent First Class is letter size, no additional. This padded envelope is a great choice for shipping at the flat rate price. Maximum weight for Priority Mail International Flat Rate Envelopes and Small Flat Rate Boxes is 4 lbs.Parcels that exceed 22 inches but not greater than 30 inches in length, add $4.00.Parcels that exceed one cubic foot (1,728 cubic inches) are charged based on the actual weight or the dimensional weight, whichever is greater (as calculated in DMM 113.1.3).For Sunday/Holiday delivery, add $12.50.USPS Marketing Mail Eligibility Decision Tree.Padded Flat Rate Envelope (12 1/2 x 9 1/2) 8.30: Qualifications for Using Own Packaging: Cost to Ship: Savings: Weighs 0.5-1 lb. Designing Letter and Reply Mail (PUB 25) We explain USPS Flat Rate box sizes, prices, discounts, and how they works.

Flat rate envelope size usps