One of the principles of organizing is making the most of the space you do have. In the kitchen, that means using containers that are square, that stack or nest and that can be used for a variety of purposes.
I like the Rubbermaid with Easy Find Lids because they are available in several sizes and the same lid fits all of them. In addition, the lids attach to each other and to the bottom of the containers, so you won’t lose them. I find the 3-cup, 5-cup and 7-cup sizes are the most versatile; however, they do offer smaller and larger sizes.
Regardless of the brand you use, stick with the same type of container and limiting the number you have. Don’t buy a set if you won’t use all the pieces, even if it seems to be a better deal. If the unused pieces become clutter, they aren’t a bargain.
I did not receive compensation for this recommendation, I just really like the Rubbermaid line. You can buy them online, at grocery and department stores.