Moisture Seal Envelopes

(33 products)

HIGH-TACK GUMMED FLAP — AUTOMATED INSERTER READY

Moisture Seal Business Check & Window Envelopes

High-efficiency moisture seal gummed envelopes engineered for high-volume automated inserting equipment and manual mailing with confidential security tinting and precision QuickBooks® window alignment.

✔ High-Tack Water-Activated Gumming ✔ Ideal for Auto Inserters & Postage Meters ✔ Confidential Inside Security Tint ✔ ⚡ Fast Shipping Nationwide

Shop Moisture Seal Envelopes by Style

Select your required window placement or envelope layout below.

QUICKBOOKS® CHECK FORMAT

Double Window Moisture Seal

Displays return and payee addresses clearly while concealing check amounts and sensitive bank details. Standard and reverse flap styles available.

Shop Double Window

INVOICES & STATEMENTS

Single Window Moisture Seal

Designed for high-speed automated mailing of invoices, statements, and claim forms requiring one window.

Shop Single Window

PRE-PRINTED LOGO

Custom Imprinted Moisture Seal

Arrives pre-printed with your company return address and logo for professional high-volume corporate mailing.

Shop Custom Imprinted

Moisture Seal & Auto-Inserter Specifications

Built for smooth machine feeding, reliable water-activated bonding, and total privacy.

✔ High-Tack Water-Activated Gumming

Automated Inserter Compatibility: Formatted for Pitney Bowes®, Neopost®, and standard automatic inserting machines.
Reverse Flap Options: Specialized flap design prevents snagging inside high-speed mail processing equipment.
Instant Moisture Activation: Water-activated gum creates a permanent, tamper-proof seal upon contact.
Bulk Storage Ready: Heavyweight 24# white wove stock resists humidity and flap sticking during storage.

🔒 Security & Privacy Protections

Complex Blue Security Tint: Full interior pattern prevents inspection of check amounts under bright light.
Precision Window Positioning: Standard #8, #9, and #10 sizes align perfectly with QuickBooks® checks.
Heavyweight 24# White Wove Stock: Prevents tearing or show-through during postal transportation.
Tamper-Evident Seal: Permanent adhesive bond tears paper fibers if unauthorized opening is attempted.

100% Window Fit Guaranteed

Precision window placement aligns with QuickBooks® laser checks.

Confidential Security Tint

Interior security pattern hides check amounts and routing numbers.

Auto-Inserter Machine Ready

Engineered for jam-free feeding in automatic envelope inserting machines.

Double Window Envelope (Moisture Seal) 3 3/4 x 8 5/8 -500 Qty

Regular price $85.00
Double Window Envelope (Moisture Seal) 4 1/8 x 9 1/2 -500 Qty

Regular price $85.00
#10 Double Window Envelope (Moisture Seal) -500 Qty

Regular price $85.00
#10 Double Window Envelope (Moisture Seal) -500 Qty

Regular price $85.00
Double Window Envelope (Moisture Seal) 3 7/8 x 9 1/8 -500 Qty

Regular price $79.05
Double Window Envelope (Moisture Seal) 3 7/8 x 8 5/8 -500 Qty

Regular price $79.05
#10 Double Window Envelope (Moisture Seal) -500 Qty

Regular price $101.15
#9 Single Window Envelope (Moisture Seal) -500 Qty

Regular price $87.55
Double Window Envelope (Moisture Seal) 4 1/8 x 9 -500 Qty

Regular price $79.05
Double Window Envelope (Moisture Seal) 3 7/8 x 8 7/8 -500 Qty

Regular price $85.00
Double Window Envelope (Moisture Seal) 3 3/4 x 8 3/4 -500 Qty

Regular price $79.05
#10 Single Window Envelope (Moisture Seal) -500 Qty

Regular price $87.55
Double Window Envelope (Moisture Seal) 3 5/8 x 8 5/8 -500 Qty

Regular price $85.00
#9 Double Window Envelope (Moisture Seal) -500 Qty

Regular price $85.00
#9 Reverse Flap Double Window Envelope (Moisture Seal) -500 Qty

Regular price $79.05
Claim Form Compatible Reply Single Window Envelope (Moisture Seal) -500 Qty

Regular price $87.55
Single Window Envelope (Moisture Seal) 3 7/8 x 8 7/8

Regular price $87.55
Double Window Envelope (Moisture Seal) 3 5/8 x 8 5/8 -500 Qty

Regular price $85.00
Double Window Envelope (Moisture Seal) 3 5/8 x 8 7/8 -500 Qty

Regular price $85.00
Double Window Envelope (Moisture Seal) 3 7/8 x 9 7/16 -500 Qty

Regular price $79.05
Double Window Envelope (Moisture Seal) 3 7/8 x 9 1/8

Regular price $85.00
Claim Form Compatible Reply Double Window Envelope (Moisture Seal) - 500 Qty

Regular price $79.05
Double Window Envelope (Moisture Seal) 4 1/8 x 8 7/8 - 500 Qty

Regular price $101.15
Single Window Envelope (Moisture Seal) 3 5/8 x 8 5/8 - 500 Qty

Regular price $87.55
Double Window Envelope (Moisture Seal) 3 7/8 x 9 1/8 - 500 Qty

Regular price $79.05

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