Square Envelope
Need envelopes that break away from traditional formats and add a modern touch?
Our custom square envelopes are perfect for invitations, greeting cards, brand announcements, or marketing materials — giving your message a bold, symmetrical look.
Available in multiple sizes and materials, these envelopes stand out instantly and help create a lasting impression.
Availability: In Stock

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Designed To Be Bold & Balanced
We design square envelopes that reflect elegance and creativity — with clean edges, centered layouts, and the right proportions to highlight your message.
Material Options
Choose the texture and finish that fits your tone:
- Smooth white or colored paper – Clean and classic
- Kraft paper – Earthy and eco-friendly
- Linen or textured stock – Adds a luxury feel
- Recycled paper – Green and professional
Flexible Sizes
From small 5×5 envelopes to oversized square mailers, we customize the size to suit your content — invitations, booklets, or folded cards.
Sharp, Centered Printing
We use CMYK, digital, and offset printing for crisp text, balanced design, and vibrant color that holds up even on bold backgrounds.
Smart Functional Add-ons
Upgrade the look and utility of your square envelopes with:
- Peel & seal or gummed flaps
- Foil lining or custom interiors
- Embossed or debossed logos
- Printed return and address info
- Matching enclosure cards or inserts
Types of Square Envelopes
We create square envelopes for all occasions:
- Wedding and event invitations
- Greeting or holiday cards
- Announcement mailers
- Brand lookbooks or small brochures
- Promotional print campaigns
Built Around the 3Ps
Each envelope balances design and practicality:
- Presentation – Eye-catching, modern, and well-aligned
- Preservation – Protects enclosed material from wear
- Protection – Sturdy construction for mailing or hand delivery
Finishing Options
Add refinement with professional finishing choices:
- Gloss or matte coating
- Soft-touch lamination
- Foil stamping (gold, silver, rose gold)
- Spot UV accents
- Rounded corners or custom die-cuts
Why Choose Us?
We help you bring elegance and structure to your printed communication with square envelopes designed for standout impressions. You’ll get:
- Design assistance tailored to your needs
- Low minimum order quantities
- Quality materials and print consistency
- Quick production and delivery
- Sustainable stock options
- Nationwide shipping
Get A Quote
Ready to create square envelopes that are anything but ordinary?
Call us at 0000 or email us today to start your custom envelope order.
Dimensions | All Custom Boxes & Shapes, Paper Bags, Mylar Bags, Tube Packaging |
Availability | InStock |
Printing | No Printing, CMYK, CMYK + 1 PMS Color, CMYK + 2 PMS Colors |
Paper Stock | 10pt to 28pt (60lb to 400lb) Eco-Friendly Kraft, E flute Corrugated, Bux Board, Cardstock, Mylar, Paper Bag Stock, Tube Paper, Bespoke Packaging Materials |
Quantities | No Minimum Order Required |
Coating | Gloss, Matte, Spot UV, Holographic Foiling, Gold Foiling, Embossing, Silver Foiling, Debossing |
Default Process | Die Cutting, Gluing, Scoring, Perforation |
Options | Custom Window Cut Out, Gold/Silver Foiling, Embossing, Raised Ink, PVC Sheet, Bespoke Die-Cuts |
Proof | Flat View, 3D Mock-up, Physical Sampling (On request) |
Turn Around Time | 7-10 Business Days, Rush Available |
When measuring a custom box, there are a few technical specifications that must be considered to ensure proper design, manufacturing, and fit for the product. Here are the major technical things to measure a custom box:
Inside Dimensions (Critical for Product Fit)
- Length (L): The longest side of the box measured inside from one corner to the opposite corner.
- Width (W): The shorter side of the box measured inside perpendicular to the length.
- Depth/Height (D or H): Measured inside from the bottom to the top opening of the box. Always specify that dimensions are given in Length × Width × Height.
Outside Dimensions (Important for Shipping & Storage)
- Measure the outer surfaces of the box including material thickness.
- Outside measurements are used for pallet stacking, warehouse spacing, and shipping compliance.
Material Thickness (Board Caliper)
- The thickness of the packaging material (e.g., corrugated board, rigid stock, cardstock).
- Impacts both the internal usable space and external dimensions.
Flap Measurements
- For boxes with flaps (e.g., mailer or shipping boxes), measure:
- Inner flaps: Ensure they meet in the middle without overlapping too much.
- Outer flaps: Allow proper sealing without gaps.
Tolerances
- Account for manufacturing tolerances (usually ±1/16" or ±2mm depending on material).
- Ensure the product fits without being too tight or loose.
Volume Capacity
- Calculate internal cubic capacity (L × W × H).
- Helps in determining how much space the product will occupy and shipping efficiency.
Product Orientation
- Decide how the product sits inside the box and measure accordingly.
- Orientation affects whether length or width is the primary dimension.
Die-Cut Openings or Windows
- Measure exact placement, height, and width for any cutouts.
- Ensure structural integrity when adding windows.
Printing Bleed & Safe Zones
- Include measurements for:
- Bleed area: Extra space beyond the cut line for printing.
- Safe zone: Inner area where critical text or logos should be placed.
Closure Type & Locking Tabs
- Measure slots, tabs, or locks for boxes with custom closures.
- Precision is required to avoid misalignment during assembly.
Packaging Style
- Folds, creases, and scores must be measured for accurate dieline creation.
- Different styles (e.g., RSC, tuck-end, mailer, sleeve) require specific panel measurements.
Delivering Premium Packaging. Materials Tailored for Your Brand and Product.

Cardboard
Giving cardboard material option to give versatility and durability to your box, widely used in many industries.

Kraft
Offering eco-friendly kraft material for your product with the least environmental impact and minimizing waste.

Rigid
Offering you premium rigid boxes, perfect for luxury packaging and high-end presentation.

Corrugated
Custom Boxes Lab specializes in strong, reliable corrugated boxes ideal for shipping and storage.