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White Tyvek expansion envelope with 2 inch gusset and self-seal flap

Quality Park

Quality Park R4450 Tyvek Expansion Envelope 10.00 x 15.00 x 2.00 White 100/Carton

SKU CH-5R57-TMW0Z MPN R4450

A 100-count carton of white Tyvek expansion envelopes measuring 10.00 by 15.00 inches with a 2.00-inch gusset and self-sealing closure

  • Product typeBusiness Envelopes
  • Key featuresPuncture Resistant, Tear Resistance, Water Resistant, Moistu
  • Product colorWhite
  • Size detailsWidth: 10 in Length: 15 in Gusset: 2 in
  • DetailsMailer/Envelope Type: Expansion Closure Type: Self-sealing C
  • Protects bulky mail with 2.00" expansion gusset
  • DuPont Tyvek resists punctures, tears and moisture
  • Self-sealing Flap-Stik closure speeds packing
  • 00" x 15.00" size fits large documents
  • 100 envelopes per carton for high-volume shipping

Expansion envelope for bulky mail

The Quality Park R4450 is a Tyvek expansion envelope built for shipping bulky items that are not too heavy. Each unit measures 10.00 by 15.00 inches with a 2.00 inch gusset. The carton contains 100 white envelopes suited for office mailing tasks.

Durability under repeated handling

Heavyweight Tyvek construction resists punctures and tears during transit better than standard paper envelopes. Water-resistant and moisture-resistant properties protect contents in damp conditions. The material maintains integrity when the gusset expands to accommodate thicker documents or samples.

Self-sealing closure limits

The Flap-Stik peel-and-seal strip provides a tamper-evident closure without tape or moisture. Once pressed, the bond is permanent and cannot be reopened cleanly. This design suits single-shipment use but prevents reuse for returns or multi-leg routing.

How it compares

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

Price $209.99
Pricier than about 94% of the 638 comparable items (median $61.99).

Specifications

Product
Brand nameQuality Park
Model nameR4450
Product typeBusiness Envelopes
Product colorWhite
Size & build
Size detailsWidth: 10 in
Length: 15 in
Gusset: 2 in
Shipping weight3.63 kg
Package size391 × 300 × 145 mm

Questions about this item

Will the 2.00" gusset hold its shape when the mailer sits stacked all day?

The 2.00" gusset is designed for expansion so bulky contents keep the envelope upright without collapsing under normal stacking.

Does the Flap-Stik closure need a separate moistener or tape to seal?

No extra supplies are required — just peel the liner and press the adhesive strip to seal.

Can I run these 10.00" x 15.00" mailers through a standard office postage meter?

Yes, the open-side format and flat profile feed through typical postage meters the same way as regular large envelopes.

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