Touch a mundane item (nonmagical medium size or smaller). For the duration of the spell. You can transmute the item into another form of your wish. This item is treated as magical and cannot change in size by more than one size categories. If transmuting the item into a weapon. It is considered a +2 simple or martial weapon.

Item sizes per Basic Rules(Ch.15)
Tiny (bottle, lock)
Small (chest, lute, *most weapons)
Medium (barrel, chandelier)
Large (cart, 10-ft.-by-10-ft window)