Wang Tao thought about it and acted immediately. He arbitrarily picked up a few stones and placed them into two treasure chests, then tried to put the treasure chests into the Space Backpack.
Swish—
Both treasure chests disappeared without a trace!
"It works!"
Wang Tao clenched his fist in satisfaction, but he wasn't finished yet. He attempted to open the chests inside the Space Backpack, but the chests didn't respond at all.
"Can't open them, huh..."
Wang Tao immediately waved his hand.
With a thud, the fine treasure chest hit the ground with a muffled sound. Wang Tao opened the chest again and saw the stones inside.
"...Looks like this is the only way to do it."
After some testing, Wang Tao found both good news and bad news.
The good news was that if he filled the chests with unnamed items, he could put them, along with the chests, into the Space Backpack. This was essentially the same as being able to pack anything into the Space Backpack.