Sack
You keep your substitute clothes in a sack. The clothes in the sack are just substitute clothes, so they only come out in emergencies.
たい
ふくろ
None
You need your substitute clothes so you take out your substitute clothes sack. You open it up to grab your substitute clothes, only to find out that there is a ton of salmon roe inside your sack. Oh man, you forgot all about putting that in there. You yell: F**K ROE (ふくろ) because that roe destroyed all your clothes and made it nasty.