My stash is on bookshelves in a spare room. Each shelf level is a different category of food (carbs, protein, breakfast, oils, treats, etc...) I've a separate bookshelf just for cleaning products and toiletries. I've then got a Google docs spreadsheet with a tab for each category, each tab lists the food type, quantity and the soonest BB date for each thing. Because it's a Google Doc I can do quick updates on my phone when a BB date needs to change. As the stash is quite spread out, but all in one place I'm not too worried about not being able to access the spreadsheet intermittently as it's quite easy to see what's there.
Currently anything going into the stash can't be touched before November now, but as we're semi rural I've been thinking for a while that we should extend our pantry system (which involves having roughly 2-3 weeks of mostly tinned food that's replaced when it moves into the main food cupboard). So once Brexit issues have stabilised we'll replace the stash as and when it gets used.
My next job is to sort out the freezers. Our chest freezer is on about the 5th organisational system and its not working, stuff still gets buried. I know mostly what's in there as we have whiteboards on the wall (in categories) listing the contents, but currently to find anything you have to cross your fingers and delve down. Anyone got any tips for organising a chest freezer?