Poly envelope has additional pocket on back. Snap closure keeps contents secure. Top loading. Letter Size. Durable poly is water and tear-resistant. Assorted. Each pack includes 3 envelopes. Sold as 2 packs for a total of 6 envelopes. Two pocket poly envelope. Durable poly is water and tear-resistant. Flat expansion. Assorted: Purple, Blue, Green. 3 per pack, sold as 2 packs, 6 envelopes total. Age: 4+ years/Grade PK+