Osprey ODP 0828 50th Anniversary T-Shirt XL grey The special-edition, 50th Anniversary T-Shirt is for a diehard fan or casual pack collector, this limited release offers a piece of history. The limited quantity of these t-shirts can make them more desirable to collectors and fans, as they offer a sense of rarity and uniqueness. Additionally, limited edition t-shirts may hold more value over time, especially if they become sought after by collectors.