F-Sack
From Homestar Runner Wiki
F-Sack is the filthy sack Strong Bad carries around in Flash is Dead!, presumably containing classic motion tweens and deprecated actions. Homestar mistakenly thinks the sack's name is Horse Giblets when Strong Bad uses that term to refer to the situation presented in the toon. Strong Bad then tells him the sack's name is F-Sack. In an Easter egg, the filthy sack says that sometimes it thinks Horse Giblets would have been a better name.
