Bundle Texture Animations

So I am so glad that that bundles are added to Minecraft but I noticed something about the new texture. Now I don't know if animation is the right word but I think the old bundle used to change to change textures to indicate if it's full or not. Well I think that should be added back to the modern bundle but with a little change. Since the new bundle has a storage bar (that's what I'm calling the bar in the bundle GUI) I thought that the bundle should have an empty texture when it's crafted and have a fuller texture every time the storage bar is full until eventually the bar is filled where it then has the texture that it has now.