How do I design custom poly mailers and control print costs?

Spot-logo vs full-bleed printed poly mailers: how do they differ?

When you request a quote for custom shipping poly mailers, the first artwork choice is print coverage. A spot-logo design places your brand mark, tagline and social handle in the center of a white, black or stock-colored poly mailer with generous unprinted margins around the edges (see our poly mailers with logo page). Because the ink does not touch the left, right or bottom edges of the web, spot printing uses fewer ink stations and runs rapidly on press. A full-bleed design floods 100 percent of the front panel, back panel and top sealing flap with your custom Pantone background color, photographic gradient or repeating monogram pattern (see our custom printed poly mailers page). Full-bleed mailers extend artwork 0.125 inches (⅛ inch) past the cut lines so zero white edge shows anywhere on the bag.

How do the top self-sealing flap, tear strip and side welds work on the dieline?

A poly mailer is sealed shut by folding the top 1.5 to 2 inch lip over onto the upper back panel (or front panel, depending on which side you designate as the front). That means the top 2 inches of your back panel will be covered by the folded flap once the bag is packed and sealed. Never place your return address, website URL or care icons in the top 2.5 inches of the panel where the flap lands. If you choose a return-ready dual adhesive strip, the top flap is slightly taller (typically 2.25 to 2.5 inches) and carries three horizontal features: the outbound hot-melt tape strip near the tip of the flap, a laser-perforated tear line in the middle, and a second release-lined tape strip closer to the bag mouth. Printing a small dashed scissor or pull-tab icon right along the perforated tear line shows customers how to open the mailer cleanly without cutting the garment inside with scissors.

1. Left and right side heat welds: keep all text and logos at least 0.5 inches inside the outer side edges.
2. Bottom fold or bottom gusset: keep text 0.5 inches above the bottom fold (or 1 inch above an expandable bottom gusset).
3. Flap landing zone: leave the top 2.5 inches of the receiving panel free of important text so the folded flap never hides copy.
4. Perforated tear strip: add a clear 'Pull here to open · Save bag for returns' callout along the tear line.

Where should the 4 × 6 inch thermal shipping label go on a printed poly mailer?

Every parcel shipped via USPS, UPS, FedEx or DHL requires a standard 4 × 6 inch thermal barcode label. If your poly mailer has a large centered logo on both the front and the back, hurried fulfillment staff will stick the 4 × 6 label right over your logo on half of your shipments. Solve this on the dieline by making the front panel your hero brand billboard and dedicating the back panel to fulfillment. Print a subtle 4.25 × 6.25 inch corner-tick frame on the back panel labeled 'Place 4 × 6 shipping label here'. If your mailer uses metallic foil stamping, keep that 4 × 6 inch rectangle free of foil so thermal adhesives bond permanently and laser sorting scanners read the barcode without glare. You can also place your suffocation warning text, recycling symbol and bag dimensions in small 8-point type along the lower back edge below the label frame so the front panel stays completely clean.

1. Front panel: keep 100% focused on your brand logo, tagline and campaign pattern for unboxing photos.
2. Back panel center: add a 4.25 × 6.25 inch corner-tick box to guide fast 4 × 6 thermal label placement.
3. Back panel bottom margin: place required child-safety suffocation warning text and material recycling marks.
4. Back panel top 2.5 inches: leave clear of critical text so the folded self-sealing flap lands cleanly.

What drives the unit cost of custom poly mailers?

Four main variables control the unit price of a custom poly mailer: bag dimensions (Width × Height plus any bottom gusset), film thickness in mils, ink coverage (1-to-2 color spot logo vs full-bleed CMYK/Pantone flood), and total order quantity. Because press setup spreads across the entire production run, stepping up from a small starter quantity to the next volume tier drops the price per bag noticeably. You can enter up to three quantity tiers in Step 1 of the quote form to compare how the unit price scales across larger runs. To maximize your budget, consolidate your fulfillment into two versatile mailer sizes (such as 10 × 13 inches and 14.5 × 19 inches) rather than splitting your quantity across five slightly different bag sizes. At CubitPack, you never pay die or plate charges, your first order receives 10% off, and we beat any written quote from a US competitor for the same specifications.

How do I send artwork or turn an AI concept into a press-ready poly mailer?

If you have vector artwork in Adobe Illustrator (.ai), PDF or EPS format, upload it on the quote form and our prepress specialists will place it onto your exact Width × Height mailer dieline at no cost. If you only have a PNG logo, a Canva mockup or an AI-generated design concept, use our free design help or print your AI design service. We convert raster concepts into crisp vector paths, assign exact Pantone color codes (backed by our Pantone match guarantee), and send you both a flat 2D digital proof and an interactive 3D mockup to approve before you pay. Standard production takes 10 to 14 business days after proof approval (or 4 to 5 business days with rush), and standard shipping across all 50 US states is always free.

What are the most common custom poly mailer design mistakes?

Check these five prepress and fulfillment details before approving your poly mailer proof

1. Placing a hero logo on both sides of a small 6 × 9 or 10 × 13 inch mailer without leaving a clear 4 × 6 inch zone for the shipping label.
2. Putting website URLs, social icons or return instructions in the top 2.5 inches of the back panel where the folded adhesive flap covers them.
3. Printing dark external ink on a single-layer translucent bag instead of specifying a co-extruded mailer with an opaque black inner security lining.
4. Including a dual return adhesive strip without printing a visual 'Tear here to open · Use second strip for returns' guide line for the customer.
5. Uploading low-resolution 72 DPI screenshots for full-bleed patterns instead of vector artwork or 300 DPI print files.

Packaging for this

Custom Poly Mailers

Custom Printed Poly Mailers

Custom Poly Mailers with Logo

Custom Thank You Cards

Print your AI design

Custom print your AI design

Custom Kraft Stand Up Pouches

More guides