Resizing items is an important mechanic in Erfworld, which serves two main purposes:
- it allows persons of different stature to use same items with convenience ("one size fits all"), and
- it allows storing items in the personal inventory without much encumbrance.
Items that can be resized include Magic ItemsTBFGK 33, and even ArkentoolsLIAB Text 29. The Arkentools at least, can be resized significantly, though this takes great effort. Notably, making the Arkendish gigantic gives Charlie more capabilities than at smaller sizes.
It is mentioned that non-magical items cannot be resized.LIAB Prologue 7, WoT-4047518 However, it is unclear whether this limitation is only true for increasing or decreasing the size of an item for ease of use or convenience, or it also applies to moving items to and from inventory. It seems that some items that can be stored in the inventory (shrunk for storage and expanded for use) are not magical (Vinny's coffinTBFGK Epilogue 10, Jillian's tent and bedrollTBFGK Epilogue 12, capture netIPTSF Text 19 are examples).