I thought this was a 4x5 Bag Mag when I bought it... It has 3x4 opening. Septum is 3 1/4" x 4 1/4", all 12 septums are included, numbered and look usable. The bag has been replaced, I don't know how light tight it is.
$50 shipped US, +$10ish for international (shipped in small flat rate USPS box) open to offers or trades of something interesting
$50 shipped US, +$10ish for international (shipped in small flat rate USPS box) open to offers or trades of something interesting