| Trade Size | #13 1/2 |
| Pre-Consumer Recycled Content Percent | 0% |
| Post-Consumer Recycled Content Percent | 0% |
| Total Recycled Content Percent | 0% |
| Expansion | 2" |
| Seam Type | Center |
| Exterior Material(s) | DuPont™ Tyvek® |
| Preprinted Message | First Class Mail |
| Security Tinted | No |
| Opening | Open Side |
| Flap Type | Square |
| Format/Border | USPS First Class Mail Format & Border |
| Color(s) | White |
| Color Family | White |
| Basis Weight | 18 lb Tyvek |
| Footnote 1 | DuPont™ and Tyvek® are registered trademarks of DuPont™ |
| Footnote 2 | Tyvek® basis weight is measured in pounds per 500 uncut 24" x 36" sheets of Tyvek® material |
| Special Features | USPS First Class Mail—Heavyweight 18 lb Tyvek® |
| Global Product Type | Catalog Envelopes |
| Envelopes/Mailers Closure | Redi-Strip® Adhesive |
| Envelopes/Mailers Exterior Dimensions | 10 x 13 |
| Product Biodegradability in Days | 0 |