When the survivors discovered and began using the wondrous objects, they not only found many with storage abilities but even figured out the rules and confirmed which objects possessed this storage ability.
Generally, there were two types of wondrous objects with storage abilities. The first were those whose appearances made their function obvious, such as bags or boxes; their storage space, under normal circumstances, was not much different from similar mundane items.
However, the space inside these objects was like another dimension; as long as items could be placed inside, no matter how heavy they were, the weight was imperceptible from the outside, and they appeared as if nothing had been stored at all.
The second type of storage-enabled wondrous objects resembled the storage rings or bracelets from traditional novels—extremely small on the outside, but with a large storage space inside.