If the postal service is expected to withstand the rain, sleet, and snow, shouldn’t the durability of your envelopes match? Strong mailing envelopes for various types of business letters and documents offer this strength. Large and small white and kraft mailing envelopes provide the space for documents of several sizes, while weatherproof tyvek holds through rain and other conditions. Through our extensive selection, find pre-printed first class, top or side open, and self-seal mailing envelopes, on which a business logo can be added at no charge.