To attach a customs form to a package, seal the box first, slide the printed electronic customs form into a clear USPS adhesive pouch (PS Form 2976-E for most parcels, or the smaller 2976-ES for flat rate envelopes and small boxes), and press the pouch firmly onto the same side as the shipping label without covering any addresses or barcodes. The form has to be visible through the transparent window, and the pouch has to stay put through rough handling and humid sorting facilities, so the order of operations and the placement both matter.
Seal the Package Before You Touch the Form
Tape every seam with strong packing tape, and reinforce the bottom if the contents are heavy. This step comes first for a reason. If the box shifts or a flap lifts during transit, an adhesive pouch stuck across that seam can peel off with it. Keep the pouch on a flat, uninterrupted panel, and finish the box before you start thinking about where the form goes.
Get the Right USPS Customs Pouch
USPS provides two sizes of transparent, self-adhesive customs declaration envelopes made to hold the printed form and keep it visible to handlers and customs officers:
- PS Form 2976-E is the standard size and fits most packages.
- PS Form 2976-ES is smaller and designed for Priority Mail International Flat Rate Envelopes, Small Flat Rate Boxes, and other compact parcels.
Both are free at any post office. Grab a few extras when you go, so you’re not making a second trip the next time you ship.
Print the Electronic Form First
You cannot attach a handwritten customs form anymore. USPS has made all pre-printed, fill-in-by-hand versions of PS Forms 2976, 2976-A, and 2976-B obsolete and prohibited from use, because customs data must be transmitted digitally before the package leaves the country. Whatever you slide into the pouch has to come from an electronic source. You have three ways to produce one:
- Use Click-N-Ship or the USPS Customs Form Online tool, fill in the details on your computer, and print the form at home.
- Use USPS-approved vendor software from a third-party shipping platform that connects to USPS systems.
- Fill out PS Form 2976-R, the paper worksheet, by hand and bring it with your package to a USPS retail counter, where a clerk enters the data and prints the electronic form for you. The worksheet on its own is not a valid customs form and should never be what ends up in the pouch.
If you go the counter route, the clerk will typically insert the printed form into the correct pouch and attach it to your package for you. If you print at home, the rest is on you.
Place the Pouch on the Address Side
Position the customs pouch on the same side of the package as the shipping label, close to it, without covering any part of the address or any barcode on either document. Customs officers and sorting machines need to read both at the same time, and anything obscured can hold the package up.
Choose a flat, uninterrupted surface. Stay away from seams, edges, and corners, where tape can peel, cardboard can flex, and machinery can catch a lifted edge. A single panel of a well-taped box is what you want.
If the printed customs form is larger than the pouch, fold it so that the barcode, both addresses, the contents list, and the declared values all remain visible through the transparent window. Fold the excess behind the visible face rather than letting it bunch up inside the pouch, which can obscure important fields.
Press the Pouch Down Firmly
Peel the adhesive backing off in one motion. Lay the pouch down where you want it, then press across the entire surface with the flat of your hand. Run your hand over it several times and pay extra attention to the edges and corners.
The edges are where failure starts. A pouch that lifts at one corner in a humid sorting facility can catch on machinery and tear off entirely, taking your customs declaration with it. Once the form is gone, the package is effectively undeclared, and customs officials in the destination country can reject, return, or destroy it at their discretion.
What to Bring If You’re Attaching at the Counter
If you’d rather have USPS handle the physical attachment, bring the sealed package and your completed PS Form 2976-R worksheet to a retail counter. The associate will enter your declaration into the system, print the electronic form, insert it into a 2976-E or 2976-ES pouch as appropriate, and attach it to the package. Retail associates also verify that the customs form is complete and properly attached before the package enters the mail stream, which is a useful second set of eyes if it’s your first international shipment.
If You’re Shipping With FedEx, UPS, or DHL
These carriers handle customs documentation through their own online shipping systems. You enter item descriptions, values, and recipient details on screen, and the carrier produces the export paperwork as part of the shipping process. You generally do not need to source your own plastic pouches or attach forms manually the way you would with USPS, so the pouch-and-press steps above apply specifically to USPS international mail.
Quick Attachment Checklist
- Box sealed on every seam with strong packing tape.
- Customs form generated electronically and printed.
- Correct pouch size selected: 2976-E for standard parcels, 2976-ES for flat rate envelopes and small flat rate boxes.
- Form folded, if needed, so addresses, barcode, contents, and values show through the window.
- Pouch placed on the address side, on a flat panel, not crossing seams or edges, not covering the shipping label or any barcode.
- Adhesive pressed down across the whole surface, with special attention to the edges.
Get those six things right and the form will still be on the box when it reaches the destination country’s customs authority, which is the entire point of the exercise.