Undetectable Extension Charm
From Absit Omen Lexicon
Spell Name: Undetectable Extension Charm
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Description: Causes a container's capacity to be increased, without changing the object's external appearance, or its weight noticeably. The container may be carried or used as normal.
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References: This spell is used by Mr Weasley to allow eight people, six large trunks, two owls, and a rat to fit comfortably inside his modified Ford Anglia in Chamber of Secrets. Hermione casts this spell upon her small beaded handbag in Deathly Hallows. Probably used in Goblet of Fire to make the tents internal appearance bigger.
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