Fantasy: I Am Invincible With A Multi-Billion Increase At The Beginning

I, Li Taihang, have a one-dimensional space bag that can store an object and multiply it by tens of billions.
Originally a first-level mortal, he embarked on the path of cultivating immortality in order to seek immortality!
Even though the road to immortality is long and long, even though there are all kinds of difficulties and dangers, my life will not stop and my cultivation will not stop!
For details, please read the text.