Kraft Envelope with flap 2-1/4x3-1/2

500 ENVELOPES IN EACH BOX FEATURE: Perfect for soil samples, concentrates, and any small samples or items. Good for both field and laboratory use. 28 LB BROWN KRAFT STOCK: Manufactured from durable 28 lb. stock. The durability of the heavy paper will withstand normal wear and tear of everyday use. GUMMED FLAP: These envelopes have a moisture activated secure seal with deep Gumming on the flap. The flaps close with full flap GUM (note that these envelopes do not include a tin-tie).