While I bought these mainly for my bras so they wouldn't get caught in other clothes and ruin them, these bags can be used for other purposes as well. Two bras in a small bag don't even occupy half of the space available!
You can use them to wast delicate shoes or clothes, bring them with you when you travel to separate the dirty laudry or certain clothes. I used them only twice so I can't say lots on how long they will last, but don't seems they will fall a part but made of a durable material.