All mailing envelopes are not created equal. Some are big, some are small. And some even have a window or two (typically, business envelopes have this unique feature). Window envelopes are very popular for businesses because they save time in mass mailings. No additional labeling needed. We have many awesome window envelopes to choose from, in various styles and quantities. But what’s an envelope without a way to open it? Fear not. Zoro has great letter openers to choose from. To complete your desk essentials, we also have paper clips, office tape, and sticky notes and flags.