Winner
Amazon Basics 9 x 12-Inch Clasp Kraft Envelopes, Gummed, 100-Pack
Amazon Basics
Quality Park 9 x 12 Clasp Envelopes with Deeply Gummed Flaps, Great for Filing, Storing or Mailing Documents, 28 lb Brown Kraft, 100 per Box (QUA37890)
Quality Park
Best Value
Mead Letter Size Mailing Envelopes, Clasp Closure, All-Purpose 24-lb Paper, 9" X 12", Brown Kraft Material, 20/Pack (76020)
Mead
Clasp Envelopes - 10x13 Inch Brown Kraft Catalog Envelopes with Clasp Closure & Gummed Seal – 28lb Heavyweight Paper Envelopes for Home, Office, Business, Legal or School 15 Pack 10x13, Brown Kraft
EnDoc
Mead Letter Size Mailing Envelopes, Clasp Closure, All-Purpose 32-lb Paper, 9" X 12", Brown Kraft Material, 100/Pack (CO790)
Mead