#14 brown Kraft envelopes for mailings that require strength or confidentiality. When business mailings are oversized and require a little extra durability and confidence these brown Kraft envelopes will do the job. The heavyweight 28-lb Kraft stock is strong and opaque-no security tint necessary. It also stands out against white envelopes, so it will be noticed. Fully gummed flaps provide a secure seal and the large quantity gives you a lasting supply to reduce purchasing.