Great idea came to my mind. Sandbags crafting them using 8 paper and 1 block of sand. You can make a sand bag wall for protection against gun fire. But the bullets can destroy the sand bag if you fire at it to much.

You know how sea pickles can multiply when added more to it. Maybe the sand bags can do the same you keep added more sandbags to the sandbag wall? and as the sandbag wall takes damage, it would be more like how the sea pickels are added to each other but in reverse. so it would count down the sand bag wall.

the max amount of sand bags you can add to your sand bag wall is 8 that is when its a full sand bag wall. and i think depending on how much sand bags you have on the wall depends on how much health it has. so 1 sand bag equals 6 HP (3 Hearts). so when you add up to 8 sand bags it equals (24 hearts). you can only hold 8 sandbags in a single slot in your inventory.

This would be epic