This purse looks like it is made from the dry, somewhat tattered skin of a large toad, complete with head and legs. The toad’s lips have been replaced with a bronze clasp that is bright green with verdigris. The purse radiates moderate transformation and conjuration magic. Looking into it reveals a shiny silver piece of unknown origin and (possibly) an ordinary copper piece. The script and images on the faces of the silver coin are impossible to decipher, even with magic.
As long as that specific silver coin is in the purse, this item will hold an unlimited number of coins and gems, and it will never gain any additional weight or bulk. All money and gems placed in the purse have their value converted to copper pieces, however. As long as it has any money in it at all other than the silver piece, it will look, feel, and sound like it contains a silver and a copper. Only one copper at a time may be taken from the purse, and the holder of the purse must count out loud as each piece is taken out of it. Each 1,000cp (10gp) takes about fifteen minutes to extract. In the event the holder of the purse loses count, then all coins must be returned to the purse before the count can be reset. If for some reason the coins cannot be returned to the purse, the count will reset at the next sunset. Only divination magic can determine how many coins the purse truly holds.
If the silver coin is removed, then any money it holds is inaccessible until the silver piece is returned to the purse. Without the silver piece, the purse functions as a non-magical container, and placing the silver piece in a different container does not give that container any special properties. Obviously, turning the purse upside down or inside out causes the silver coin to fall out.
The purse is considered to be a bag of holding for purposes such as determining the outcome of placing one extra-dimensional item inside another.