These containers are incredibly durable and they stack nicely to keep a pantry very organized.
Some containers seal better than others, but I find that it isn’t al way airtight and the lids may be removed without releasing the seal.  You may overcome this by for placing the cover on, depress the seal button on the top, and then remove and replace the cover, without depressing the seal.  This seems to help to get the tightest seal, but it isn’t complete air tight.
They do come in a variety of sizes, so you’re sure to find the right size to fit your needs.  Depending on the size you’re looking for and the amount you need, you could end up paying a high price point for these containers.