LION side load clear plastic envelopes with string tie closure for extra security. Expanding envelopes with 1-1/6 inch gusset are spacious enough to fit most letter size manila folders. Durable document envelopes with string & button tie closure are perfect for keeping your documents and folders secure. Transparent envelopes give clear view of contents. Reduce the amount of fading in photos and artwork by safely storing them in these acid free envelopes. Environmentally friendly recyclable envelopes. 6 letter size envelopes / pack.