Three-ring poly envelopes keep and protect unpunched documents, photos and other loose items. Durable polypropylene material is wear-resistant, tear-resistant and water-resistant. Acid-free, archival-safe, clear poly allows easy viewing of contents. Gusset expands to hold up to 1-1/4" and great for organizing letter-size documents and smaller items. Flap and hook-and-open closure keep your documents safe and secure. Poly envelopes are three-hole punched for use in standard-size three-ring binders. Side opening allows easy loading even when poly envelopes are secured in a binder.