From MLB Power Pros Wiki

Item Description

The Surprise Bag is an item in Success Mode that contains a random item. Once acquired, it can be used on the inventory screen to reveal its contents.

Though not sold at Bison's Shop during the game, it will become available for purchase on the final screen after successfully completing Success Mode. The Surprise Bag can also be obtained from various events.

Possible Items

• All shop items except Bats, Gloves, Spikes
• Non-shop items: Gundar Robots (2007 only), Baseball Tickets (2007 only), Discount Coupon, Candy, Gambler's Ring
• Books: Legends of Baseball, Secrets of Pitching, Secrets of Hitting, Secrets of Defense