This is useful as a guide for understanding the effects of these stats, but it's worth noting this won't hold up when you start factoring in other things. In particular, you show the bags getting bigger in both 2 and 4, which is incorrect - these only affect the total recovery - multiplying how much blood is coming out of the combined tubes, they do not affect the actual sizes of the bags. The only analogy I can come up with that fits is a blood donor who's promised to donate their own blood to match a % of what you're getting from the bags.
This is notably important in the case of The Retch, which applies a dot based on each leech instance - those stats aren't actually affecting the "bag size", so The Retch's dot is likewise not affected (stat 1, which does affect the maximum bag size, does affect the DoT).
Also the last panel is incorrect when it says ES leech is the same - the maximum total for ES (width of the opening in your analogy) is 10%, where for life and mana it's 20% of the max.