Industrial shipping departments and e-commerce fulfillment operations that require durable, moisture-resistant mailers for First Class Mail items up to 1.5 inches thick. The 10 x 13 x 1 1/2" expandable design accommodates bulky documents, samples, and small parts while meeting USPS First Class specifications, making it ideal for businesses prioritizing shipping compliance and cost-per-unit efficiency.

Best For
How to choose
Specs at a Glance
| Material | 18 lb. Olefin (DuPont Tyvek®) |
| Dimensions | 10 x 13 x 1 1/2 inches |
| Color | White/Green |
| Closure Type | Self-Seal (Redi-Strip) |
| Recyclable | Yes |
Common Use Cases
- First Class Mail shipping for documents, catalogs, and marketing materials E-commerce fulfillment for samples, small parts, and promotional items Pharmaceutical and medical device distribution requiring moisture protection Electronics and component shipping with static/puncture protection Secure document mailing for legal, financial, and confidential records
What You'll Receive
- 100 self-seal expandable Tyvek® envelopes per case (SKU: TYE10131FC)
Shipping & Packaging
Frequently Asked Questions
Yes. The 10 x 13 x 1 1/2" dimensions meet USPS First Class Mail specifications for padded mailers, reducing postage costs compared to Priority Mail and ensuring on-time delivery for lightweight shipments.
Tyvek® 18 lb. olefin is 10 times stronger than paper envelopes in tear and puncture resistance. This durability reduces damage claims, customer returns, and replacement costs across your shipping operations.
No. The integrated Redi-Strip self-seal closure provides secure, tamper-evident sealing without tape, glue, or additional labor. Simply peel and press for fast, consistent closure every time.
The expandable sidewalls accommodate documents up to 1/2 inch, padded samples, small circuit boards, fabric swatches, jewelry, photos, and soft components up to the 1 1/2 inch depth, eliminating the need for rigid boxes and reducing dimensional weight charges.
Technical Specifications
| Closure Type | Self-Seal (Redi-Strip) |
| Recyclable | Yes |
| Color | White/Green |
| Strength / Material | 18 lb. Olefin |
| Dimensions (Internal) | 10" × 13" × 1 1/2" (L × W × H) |
Shipping Information
Outer Carton Dimensions
10" × 13" × 1 1/2" (L × W × H)
Unit of Measure
CASE
Qty Per Shipping Unit
100 PER CASE
LTL Freight Class
Class 78
Delivery Method
Shown at checkout
Processing and delivery timelines vary by product, warehouse, order size, and destination. Freight-sensitive or oversized items may require LTL delivery or a custom quote before shipment.
Checkout shows available shipping options for the selected SKU and quantity. Use the shipping and refund policy links for current policy details before ordering.
For larger, recurring, freight-sensitive, or mixed-SKU orders, send the SKU or product link, quantity, delivery ZIP code, receiving notes, and timing to support@packrift.com.
ORDER SUPPORT
Product Support
Specs, case quantities, and availability are listed on each product page. For bulk, mixed-SKU, or LTL freight orders, email support@packrift.com with the SKU, quantity, and delivery ZIP.
Use product support for fit, larger or recurring order, return, or order-issue questions. When price and Add to Cart are shown, checkout remains the direct ordering path.
Need a sample, fit check, or substitution review? Contact product support with the SKU, selected option, order quantity, and use case. Support will confirm the available path for that item.
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Buying notes and spec resources stay here instead of taking space above the cart.
Use this product as the source
10x13x1.5" Tyvek Expandable Self-Seal Envelopes - First Class, 100/Case
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Compare resources using the current product page data: SKU TYE10131FC , type Envelopes & Mailers , sold-as unit CASE / pack count 100 PER CASE . Confirm the product page price, availability, and selected variant before ordering.
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