Most people find the Magicalls only last a couple of hours, I would definitely not be using one overnight. They are trim, but best for daytime use.

Most nappies that will last the distance overnight will be bulky. As Saram said, a fitted with a cover is your best bet. I use a bamboo BBH with a PUL cover and that works well for us. Bamboo is more absorbent than hemp, so probably better for overnight.