Photo Envelopes (CH46-4P) each hold up to 72 4x6 photos and includes front slot for negatives, label. Photo Boxes (KS720-CD) are packaged and ship flat. Each holds 10 Photo Envelopes or 12 Photo Organizers. Sold in counter display of 8, two each of blue, purple, magenta, and clear. Photo Organizers (KSPO) for photos, negatives, CDs, DVDs. Each Photo Organizer holds up to 60 4x6 photos. 12 Organizers fit inside one Photo Box. Sold 4 per pack, one each blue, purple, magenta, and clear.