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White Tyvek expansion envelope with 4.00 inch gusset and self-sealing flap

Quality Park

Quality Park R4497 Tyvek Expansion Envelope 12.00 x 16.00 x 4.00 White 50 Carton

SKU CH-93TD-BWCVJ MPN R4497

A 50-count carton of self-sealing Tyvek expansion envelopes measuring 12.00 by 16.00 inches with a 4.00-inch gusset for bulky mailings

  • Product typeBusiness Envelopes
  • Key featuresPuncture Resistant, Tear Resistance, Water Resistant, Moistu
  • Product colorWhite
  • Size detailsWidth: 12 in Length: 16 in Gusset: 4 in MailerWeight: 18 lb
  • DetailsMailer/Envelope Type: Expansion Closure Type: Self-sealing C
  • Protects bulky mail with 4.00" gusset expansion
  • DuPont Tyvek resists punctures, tears and moisture
  • Self-sealing Flap-Stik closure speeds packing
  • 50 envelopes per carton for high-volume shipping
  • Lightweight 18.00 lb mailer reduces postage cost

Tyvek Expansion Envelope 12 x 16 x 4

This expansion envelope uses heavyweight DuPont Tyvek to protect bulky documents and flat items during transit. The material resists punctures, tears, water and moisture far better than standard paper mailers. It measures 12.00 by 16.00 inches with a 4.00 inch gusset for added capacity. Each carton contains 50 white envelopes.

Self-Sealing Flap-Stik Closure

The open-side design pairs with a peel-and-seal Flap-Stik strip that requires no tape, glue or moisture to activate. This closure speeds up packing workflows and creates a tamper-evident seal once pressed. The adhesive stays reliable across normal shipping temperatures. It removes the need for separate sealing supplies.

Lightweight Bulk Mailing Limits

The Tyvek construction keeps the mailer itself light at 18.00 pounds per 50-count carton, helping control dimensional-weight shipping costs. However, the envelope is intended for items that are not too heavy; dense or sharp-edged loads may stress the seams beyond the material's tear resistance. It replaces boxes only for low-density volume.

How it compares

Measured against everything we stock in Document Envelopes & Pouches, at today’s prices. Recalculated every night.

Price $175.99
Pricier than about 92% of the 638 comparable items (median $61.99).

Specifications

Product
Brand nameQuality Park
Model nameR4497
Product typeBusiness Envelopes
Product colorWhite
Size & build
Size detailsWidth: 12 in
Length: 16 in
Gusset: 4 in
MailerWeight: 18 lb
Shipping weight2.72 kg
Package size419 × 373 × 114 mm

Questions about this item

Will the Flap-Stik self-sealing adhesive lose its grip over time and need replacement?

The Flap-Stik closure is a single-use peel-and-seal adhesive; once the envelope is sealed it is not designed to be reopened or resealed, so no ongoing maintenance is required for the adhesive itself.

How much can the 4.00 inch gusset expand before the Tyvek material reaches its limit?

The envelope has a fixed 4.00 inch gusset depth that accommodates bulky items up to that thickness; the heavyweight DuPont Tyvek construction resists punctures and tears at full expansion.

Does the white Tyvek surface reflect enough heat to keep contents cool during all-day transit?

The white Tyvek material is water-resistant and moisture-resistant, but no thermal-reflectivity or temperature-control rating is provided for sustained heat exposure.

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