Shika's dimensional storage was pretty simple, but spectacular at the same time. After all, having observed its workings by being connected to all her senses, he managed to understand its secrets.
It was the space!
The dimensional storage was no different to her space, but unlike the space where only the mutated beasts could be in, this space was able to house everything, including mutated beasts.
That means, if she housed a mutated beast there, she would be able to use its ability just like usual. But for some reason, she didn't use it for that, using it as a mobile storage that she filled to the brim with items.
They consisted of canned rations, oil, seeds, agriculture tools, medical books, electronics with portable chargers, solar panels, etc. There were at least three spares to everything.