I've made the Red Rocket location home. I cleaned the place up a lot but left some of the original storage items to keep my stuff separated (since the item sorting on the PC is a nightmare).

So all my JUNK I just transfer quick and easy to the Workshop Storage. My Pre-War Cash I put in the old Cash Register (just curious as to how much I'll end up stockpiling). My Armor I put in a metal chest that I made. My alcohol is in a overhead cabinet inside (out of the reach of children). My food items I put in the big ICE chest behind the shop next to the cooking station. My clothes are in a chest I made next to my bed. Magazines in the rank that was already there.

My concern is, some of these containers might re-spawn taking all my stuff with them. I assume that containers I make don't re-spawn ... but I don't know that for certain. I can also assume that containers that are within the 'Settlement Zone' don't re-spawn ... but again I don't know that for certain.

Does anyone know what storage is or is not safe?

Created my own storage day 1 and all the stuff I put in there is safe.

I've checked and re-checked the existing storage after clearing it out and nothing refills in settlement areas.

Outside your boundary is a different story.

I had a lot of excess stuff after clearing the Fallen Skybridge and decided I'd dump stuff in a nearby trash can. Fast Travelled to Diamond to sell off and restock. FT back to the trash can and it's all gone. Replaced by some empty bottles and tin cans.

I can confirm this. Items within settlement locations do not re-spawn. you items should be safe. been playing for more than 24 hours now and nothing in any container at Red Rocket has respawned. I keep all my nuka cola in the Ice Chest already there. nothings happened to it. I have noticed though that sometimes items that you may drop and use as decorations may be either picked up by other characters or disappear. I don't know if this is a bug or not. I would assume that if I place a nuka cola on a bar, other characters can pick it up.

Good to know. I was going to put some tri-fold flags around since my PC is ex-military and all, but if those are going to vanish I may have to re-think that.

like I said, this like food and drink disappear sometimes, or fall and move from the location I've placed them. But if you have an empty settlement with no people, no one should take anything. unless its attacked maybe. I cannot totally confirm this, but I can confirm that containers in settlements should be safe. nothing has disappeared from mine yet.

Yeah I'm keeping the squatters out of RR this time. Just a place for me and me only ... well and my dog. I may put up some turrets anyway even though there are no settlers or crops to attract raiders (assuming that's what attracts them).

The Red Rocket is my home and it is only for my Dog and possibly for my son Shaun. I store the Power Armor there and placed turrets around the place to keep it safe. I have planted crops there and some water. I just need to build an out house.

I am trying to figure out if I can build a matching power armor for Dogmeat with a minigun turret over the shoulders. Dogmeat likes that idea