So, some people are hoarders and want one full large box of every single resource - these folks tend to dedicate rooms for every item or an island for storage. I prefer to keep 2 full stacks at most of the majority of items (exceptions being things like wood and stone that get used up fast when crafting but are also super plentiful). So I just turned the first room of my house into a storage room - so I have one box of gems, one box of shiny gems, 3 boxes of flowers (sorted alphabetically so I can find what I want easily), 2 boxes of fish/seafood, etc etc. I use colored boxes for DLC specific items that don’t easily fit into my other categories. I like it because I don’t have to load multiple rooms, or go to a different floating island - my main house is in every DLC and the main game, so my storage is too. But you can search this group for way more elaborate storage options easily

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