LION's line of specialty envelopes includes this 10" x 13" inter department envelopes with interoffice routing slip. Durable clear plastic envelopes with gusset have a velcro type closure and a full size outside pocket. These inter office envelopes are spacious enough to fit letter size file folders. With an inch expansion, 10" x 13" envelopes also make great catalog envelopes. For clear view of contents, these transparent envelopes will work perfectly. LION plastic envelopes are PVC free, acid free, archival safe, resistant to moisture & tearing. Environmentally friendly recyclable envelopes. 6 poly envelopes / pack.