Unfortunately, when the character pops back into the Discworld, they are in the same condition as when they popped into the bottle with only a vague memory of brief tranquility.
Essentially this is the game mechanic for people who can't make it to game that day. PCs whose player is not there wind up in the Bottle. The Bottle must always be carried by one of the other party members. Things cannot be stuffed into the Bottle, nor can they be removed from the Bottle. Such is the nature of magic bottles...
Yes there is a story about how the Bottle came into existence; those who wish may ask during game.
Back to the Discworld Homepage.