It might be hard to comprehend this way, so let me give you the most common life example. The intense smell that has been trapped inside a college male dormitory on a winter night after closing the windows and doors all night is something I believe most people have experienced. Especially the moment when you just breathed fresh air outside and then opened the door to enter the dormitory...
Therefore, if the smell of a living college student can become so intense after being trapped all night, then it is quite normal for the smell of a dead zombie to reach such a level when kept in a sealed room for years.
After strapping the freshly made belt around his waist, Zhang Yanhang hung the waist bag on it, and this time, he was indeed able to use the waist bag properly.
Once the waist bag was successfully engaged, two one-cubic meter grids appeared in front of Zhang Yanhang. He could place or retrieve anything he wanted into or from these grids at any time.