Great for organizing projects and lesson plans. Reusable expandable envelopes! Letter size transparent tinted poly envelopes are durable and are wear and tear resistant. See-thru material allows visibility and allows easy and quick accessibility to documents. Gusseted to expand 1-1/4". Top Load, Clear, 12/Box. Wear-And-Tear Resistant. See-thru visibility. Reusable and expandable.