Matching baskets are fantastic! Especially ones with label options to help you remember what you have stored inside. It keeps this bookcase clutter free but makes it possible to not have to store a ton of things behind closed doors.
Picking similar styles, all see through containers at the bottom and baskets at the top make this cabinet look so well organized. Clear canisters also help remind me if I'm running low on something. I also love the pop of color with the labels.
Not everything is going to fit in the same size containers and if keeping everything matching is too much of a commitment for you, you can mix it up a bit and it still look great. Just try and use similar sizes and shapes to create a cohesive look.
I love the mix of three colors here. Using pops of color is great but I love how this one is minimized to two color options and scattered throughout the storage.