Personally I'd rule that you can turn it upside down and shake it to empty it, but the items come out at random, and that can be incredibly dangerous if you know the types of people and what they tend to carry in these bags
Whenever an opponent taps a land for mana, that land doesn't untap during its controller's next untap step
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Sun Titan can be blinked, reanimated, or Voltroned, and all of those are good combinations
Think of it like your own personal Jace's Archivist, but you get to offload a bunch of the cards you discarded directly into play
Artifacts are usually (but not always) colorless, meaning they can go into any deck, but they typically have a worse mana cost to power level ratio to offset the upside of being colorless