Avery laser label l7173-100 100 sheets These Avery TrueBlock Parcel Labels are great for sending envelopes and small boxes. Our parcel labels are are completely opaque, thanks to our TrueBlock technology. They cover information that is underneath, including text, logos and torn courier labels. You can add your company logo and recipient details to the label using Avery software, and completely cover the existing information. You can save money on packaging materials, and still send a professional-looking package. It's easy to add names, titles, addresses, barcodes and company logos that make sure your letters and parcels get to their destinations and look good to boot. When your designs are done, you can print professional-looking labels from your laser printer.