self seal postal boxes

For busy packing benches, self seal postal boxes close with a built in adhesive strip, so staff can pack, press and post without reaching for tape on every order. Custom Postal Boxes makes these boxes in Wolverhampton in corrugated board with custom print options, low minimum order quantities, free design support and free UK delivery. The result is faster packing, a tidier finish and a parcel that customers can open cleanly at the other end.

How self seal postal boxes works in practice

The sealing strip sits under a protective liner on the closing flap. At packing time you remove the liner, fold the flap down and press along the strip to form a firm bond. Because the adhesive is placed by the manufacturer, every seal lands in the same place, which looks professional and holds evenly. Our self seal mailer boxes combine this closure with a mailer structure, while tear strip mailer boxes add an opening strip so the customer tears the parcel open without scissors or damage to the contents.

Packing time and consistency benefits

Removing tape from the process saves seconds on every parcel, which becomes hours across a busy week, and it removes tape cost and dispenser clutter from the bench. New staff also pack consistently from their first shift, because the seal position is decided for them. A pressed adhesive seal shows clearly if a parcel has been opened, which helps with customer queries about missing items. For returns, some designs include a second strip so the customer can reseal the same box, a detail worth asking about if returns are common in your shop.

Getting a reliable seal every time

Press firmly along the full length of the strip and keep the flap free of dust, tissue and loose fibres, which weaken the bond. Do not overfill the box, because a flap under strain will lift at the corners even with strong adhesive. Store flat boxes in a dry place away from heat so the adhesive stays in good condition. If a parcel is heavy or travelling far, tape can still be added over the seal as a belt and braces step, but for most orders within the design weight it should not be needed.

Choosing materials and sizes for self seal postal boxes

These boxes are made from corrugated cardboard, with board grade chosen for the weight they will carry. Sizes should follow Royal Mail and courier formats where possible, and the Royal Mail size and weight guidance is a useful check before you fix a size, because a well filled box in a smaller format costs less to post. Our cardboard postal boxes and small postage boxes cover plain and printed alternatives in similar sizes, so sealing style can be compared across your whole packing range before you commit.

Print options on a self seal box

Custom print can carry your logo on the lid, guidance beside the seal and a message under the flap that is revealed on opening. Keep the area around the strip clear of heavy ink coverage where possible and place opening instructions where the customer will see them before they reach for scissors. A printed box also removes the need for branded tape, which is one reason many growing shops move to this format when order volumes rise and packing consistency starts to matter as much as speed.

Print, packing and ordering advice

To order, request a quote through our contact page with your internal size, typical packed weight and quantity, and say whether you want a tear strip or a second seal for returns. Pricing depends on size, material and quantity, design support is free and UK delivery is free. Low minimum order quantities let you trial the format on your packing bench with real orders before switching a full range over. Time a small batch against your current taped boxes and the difference in packing speed and finish will usually make the decision for you.

FAQs about self seal postal boxes

How do self seal postal boxes work?

A strip of adhesive is fitted to the closing flap under a removable liner. You peel off the liner, fold the flap down and press along the strip to seal the box, with no tape needed for most orders.

Are self seal postal boxes secure in the post?

Yes, when the box is filled correctly and the strip is pressed firmly along its full length. The bonded seal also shows clearly if a parcel has been opened, which helps if a customer reports an item missing.

Can customers open a self seal box easily?

Yes, especially where a tear strip is fitted, which lets the customer pull the parcel open cleanly without scissors. Opening instructions can be printed beside the strip so the method is obvious at a glance.

Can a self seal box be reused for returns?

Some designs include a second adhesive strip for returns, so the customer can reseal the same box. Ask about this option when you request a quote if returns form a regular part of your orders.

What sizes of self seal postal boxes are available?

Boxes are made to sizes that suit your products and postal formats, from small postage sizes to larger mailer sizes. Share your product dimensions and packed weight and the size and board grade can be specified together.