Free tools for US e-commerce shippers
Pick the right mailer, keep packages out of DIM weight and pass Amazon FBA prep. No sign-up.
DIM weight calculator: box vs poly mailerBox or mailer? See the billable weight.Poly mailer size finderWhich mailer size fits your product?Amazon FBA poly bag checkerIs your poly bag FBA-ready?Mailer usage & reorder calculatorHow many mailers do you need?USPS ounce threshold checkerDoes the packaging push you into the next tier?Size and mil guideInches, millimeters, mil and micron in one place.
Want samples to test?
We reply within one business day with sizes, mil and a delivered price.
- Free sample kit shipped to your US address
- Delivered prices, DAP to your door
- Orders from one pallet, mixed sizes welcome
- Plain, printed with your brand, or fully neutral
- Meet in person in January–February 2027
Prefer email? sales@kargopekusa.com