What Are Custom Envelopes — Key Features
A custom envelope protects its contents while representing your brand. Here are the key features that define a quality envelope.
(1) Custom sizes available：Envelopes cut to fit your specific cards, documents, or products — not just standard sizes.
(2) Durable paper construction：Various paper weights from lightweight to heavy cardstock. Protects contents during mailing or handling.
(3) Full-color printing ready：Your logo, return address, or custom design printed directly on the envelope surface.
(4) Secure closure options：Gummed seal, peel-and-seal adhesive, or custom closure styles to keep contents safe.
(5) Flat storage and easy assembly：Envelopes ship flat and fold quickly when needed. Saves warehouse space before use.
Popular Envelope Types We Offer
Yucai manufactures custom envelopes for business, personal, and promotional use. Here are the most common types we produce.
Business envelopes
Standard #10 envelopes (4.125" x 9.5") for letters, invoices, and corporate mail. Available with or without windows. Gummed or peel-and-seal closure.
Invitation envelopes
A-series sizes including A2 (4.375" x 5.75"), A6 (4.75" x 6.5"), and A7 (5.25" x 7.25"). Square flaps and colored liners available. Ideal for weddings, parties, and formal events.
Window envelopes
Clear poly window on front for address visibility. Saves time on addressing. Common for billing statements, paychecks, and direct mail campaigns.
Padded envelopes
Bubble-lined interior for extra protection. Made from kraft paper or white paper stock. Suitable for shipping small fragile items like electronics or jewelry.
Square envelopes
Non-standard shape that stands out in the mailbox. Available in various sizes. Often used for greeting cards, promotional mailers, and creative packaging.
Custom die-cut envelopes
Any shape, size, or flap style based on your design file. Yucai produces custom die-cut envelopes for unique products and specialty mailings.
Standard Sizes & Custom Dimensions for Custom Envelopes
Yucai produces both standard envelope sizes and fully custom dimensions. Here are the most common sizes we manufacture.
1
#10 business envelope
4.125" x 9.5". Standard for business letters, invoices, and corporate correspondence. Available with or without window.
2
A2 invitation envelope
4.375" x 5.75". Fits 4.25" x 5.5" cards. Common for thank-you notes, small invitations, and greeting cards.
3
A6 invitation envelope
4.75" x 6.5". Fits 4.5" x 6.25" cards. Popular for photo cards, save-the-dates, and promotional mailers.
4
A7 invitation envelope
5.25" x 7.25". Fits 5" x 7" cards. Standard for wedding invitations, graduation announcements, and formal event mailings.
5
DL envelope
110mm x 220mm. Common in international markets. Fits A4 paper folded into thirds. Used for business mail and correspondence.
6
6" x 9" booklet envelope
152mm x 229mm. Fits brochures, catalogs, and booklets without folding. Open side or open end available.
7
Custom dimensions
Yucai accepts any width, height, and flap length. Provide your card or document size, and we recommend the right envelope fit.
Paper Stocks & Colors for Custom Envelopes
The paper you choose affects envelope durability, print quality, and overall appearance. Yucai offers multiple options to match your mailing needs and brand image.
White wove paper
Smooth, bright white surface with excellent printability. Standard for business envelopes, invitation envelopes, and everyday correspondence.
Kraft paper
Natural brown color with high tear resistance. Durable and eco-friendly. Common for padded envelopes, shipping envelopes, and rustic invitation suites.
Colored paper
Solid color paper stock available in dozens of shades. Matches brand colors or event themes. Suitable for invitations, promotional mailers, and special announcements.
Recycled paper
Made from post-consumer waste. Available in white, natural, or kraft tones. Environmentally friendly option for brands with sustainability commitments.
Premium cotton paper
Luxury paper made from cotton fibers. Soft texture with natural felt finish. Ideal for wedding invitations, corporate announcements, and high-end direct mail.
Translucent paper
Semi-transparent vellum-style paper. Offers a modern, minimalist look. Suitable for specialty invitations, layered mailing pieces, and creative packaging.
Custom paper weight recommendations
Standard mailing needs 70gsm to 90gsm. Heavy contents or premium invitations need 100gsm to 120gsm. Padded envelopes need 120gsm outer paper with bubble lining.
Printing & Finishing Options for Custom Envelopes
Printing turns a plain envelope into a branded communication piece. Yucai offers multiple printing methods and finishing techniques to match your budget and design requirements.
Offset printing
High-quality printing with precise color reproduction. Suitable for logos, return addresses, and full-color designs. Best for medium to large quantities.
Digital printing
Fast setup with no plate charges. Ideal for small runs, variable data printing, and quick turnaround projects. Good for personalized envelopes or test orders.
Flexographic printing
High-speed printing using flexible plates. Cost-effective for large quantities with simple one or two color designs. Common for business envelopes and bulk mailers.
Single color printing
One ink color on the envelope surface. Most economical option. Suitable for return addresses, company logos, or simple text messages.
Full color printing
CMYK four-color process. Prints photographs, gradients, and complex artwork. Ideal for invitation envelopes, promotional mailers, and brand-focused campaigns.
Foil stamping
Metallic foil (gold, silver, rose gold, or custom colors) pressed into the envelope. Adds premium, high-end appearance. Popular for wedding invitations and luxury direct mail.
Embossing and debossing
Raised or recessed design elements pressed into the paper. Adds tactile dimension without additional ink. Often paired with foil stamping for premium finishes.
Custom envelope lining
Printed or colored paper attached to the inside of the envelope. Revealed when opened. Adds surprise and luxury feel for invitation envelopes.
Closure & Seal Options for Custom Envelopes
The closure style affects security, convenience, and the overall opening experience. Yucai offers multiple closure options to match your envelope type and mailing needs.
Gummed closure
Traditional moisture-activated adhesive. Requires licking or a damp sponge to seal. Secure and tamper-evident. Common for business envelopes and invitation envelopes.
Peel-and-seal adhesive
Self-adhesive strip covered by a removable liner. Peel off the liner and press to seal. No moisture needed. Convenient for high-volume mailings and office use.
Self-adhesive strip
Built-in adhesive exposed by pulling a peel strip. Quick and easy to seal. Common for padded envelopes and e-commerce mailing envelopes.
Button and string closure
A paper or cardboard button with an elastic or string wrap. Reusable and decorative. Suitable for specialty envelopes, portfolios, and presentation mailers.
Metal clasp closure
Metal prongs attached to the envelope flap. Press through the envelope body and bend to secure. Heavy-duty and reusable. Common for catalog envelopes and file storage.
No closure (open top)
No adhesive or sealing mechanism. Flap remains loose or tucks in. Suitable for inner envelopes, card sleeves, or envelopes used inside larger packaging.
Why Choose Yucai for Custom Envelopes
Many printers offer envelopes. Here is what makes Yucai different — not the product features, but how we serve you as a manufacturing partner.
No plate charges for small runs
Yucai waives plate fees for orders under 5,000 envelopes. Small businesses and event planners save on setup costs.
One order, multiple sizes
Need five different envelope sizes for one project? Yucai combines them into a single production run. No minimum per size.
Bleed printing without extra cost
Print to the very edge of the envelope — no white border. Many printers charge extra for full-bleed envelopes. Yucai does not.
Free layout check for artwork
Our team reviews your design file for envelope-specific issues like flap overlap, window placement, and address positioning — at no charge.
Re-orders with archived tooling
We keep your die-cut tooling and print settings on file. Months later, your next batch matches the first exactly.
Mixed closure styles in one order
Need 5,000 gummed and 5,000 peel-and-seal? Yucai runs both in the same order without splitting minimums.
(1) Do you offer envelope lining?
Yes. Printed or colored liners available for invitation envelopes. Liner is visible when the flap is opened.
(2) Can you print envelopes with a custom flap shape?
Yes. Banker flap, square flap, or fully custom flap shapes based on your die-cut file.
(3) Do you provide envelope templates for designers?
Yes. Yucai provides free dieline templates in AI, PDF, or EPS format for all standard and custom sizes.
(4) What happens if my envelope order has a printing defect?
Yucai inspects every batch before shipping. Defective units are replaced at no cost before delivery.
(5) Can you ship envelopes already printed with recipient addresses?
Yes. Yucai supports variable data printing for direct mail campaigns. Provide your address list in Excel or CSV format.
(6) Do you offer rush production for urgent envelope orders?
Yes. Expedited production available in 3 to 5 business days. Additional fees apply based on quantity and complexity.
