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The Strange Sack.
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The sack permanently appears in Mario's Important Items list once obtained.
The Strange Sack is a brown sack that allows Mario and friends to carry up to 20 items in Paper Mario: The Thousand-Year Door. It is found on the 50th floor of the Pit of 100 Trials. The sack increases the number of items Mario can hold by 10, which may be why it is called "strange", as 10 items doubtly fit into the small sack.