word of warning--while stuff you place in your house in decorate mode is locked down (Even stuff in your bags that you put down), attics do not follow that rule and things can be taken so be careful who you invite in :)
@Soupie thanks for the heads up re: the attic! I didn't realise that.
@OP, unless you want to race or spend tp tokens or energy to get into the attic I'd just keep doing what you're doing! My attic is filled to the gills with my bags and stills and I've found it amazing simple to organise.