If you have to change a mechanic because it's a gamebreaker it doesn't take much to reign it in. This is a fairly simple fix.
So old crap still in bottomless purse while new crap is in a bag of shrinking. The difference being if you put someone in a shrinking bag they can still cut their way out. Bottomless purse there is no getting out of because you basically do not exist until you are pulled out.
Comic is a several hours late today because the geniuses at Canon made it so you can not scan a document when you are out of printer ink.