Smead Poly Project Envelope, 1-1/4" Expansion, String-Tie Closure, Side Load, Letter Size, 5  per Pack (89519) Poly envelopes are a great choice for conveniently storing documents whether on the desk, in the drawer or on the go String tie closure for security and portability Durable poly material resists tears and repels moisture, making these envelopes ideal for the home, office or classroom Side loading file envelopes expand to 1-1/4" and are 3-hole punched for standard 3-ring binders Includes 5 side load letter size (9-3/4" W x 11-5/8" H) poly envelopes with protective flap and string tie closure. Color assortment includes 1 each of dark blue, orange, red, teal and yellow. Acid free and PVC free