I need help to design a sack bag button, thank you

I started learning video game development and UI/UX design.

I would like to create UI/UX art asset inventory for my personal project.

I want to add a sack bag button icon and the inventory top view of a sack like the image from the bottom. I tried approaching by sketching the sack in illustrator but I have problems obtaining the same feeling as the original. is this a texture problem?

or how can create this asset?