If you need reliable envelopes for mailing booklets, catalogs, or important documents, these kraft envelopes are seriously solid! The 10x13 inch size is perfect for larger items that don't fit in standard envelopes, and the side opening design makes loading documents super easy. The 28lb kraft paper feels substantial and durable - no flimsy material that'll tear easily during mailing. I've used these for shipping important contracts and they arrived in perfect condition every time. The deep gum flap with strong adhesive actually seals properly, which is something I've had issues with with cheaper envelopes. Each box comes with 100 envelopes, which lasts a good while unless you're running a massive mailing operation. What I really appreciate is that they're made in the USA, and the quality consistently shows. The kraft color has this professional yet rustic look that works for both business and personal use. I've used them for mailing photo books, small catalogs, legal documents, and even as packaging for smaller products I sell online. They stack neatly and the uniform size makes processing large mailings much more efficient. If you're tired of envelopes that feel cheap or don't seal properly, these are definitely worth trying. They're one of those office supplies that just work exactly how you need them to, without any surprises or quality issues. Whether you're handling business mailings, wedding invitations, or just need sturdy envelopes for personal use, these won't disappoint!