They're not all that delicate to be honest... I don't ever line my bags. The only things that I worry about are sharp objects (keys), or things that contain liquid/gel-like substances (pens, perfume, lipgloss/makeup, hand sanitizer) -- for which I would use a tiny pouch. Hate pen stains on the inside of my bag. Even if I don't always see the inside, once it's there I will always notice it if you know what I mean.