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The original was posted on /r/Ultralight by /u/zakaby on 2025-08-01 07:28:46+00:00.

I saw it suggested in other threads and have tried it myself. Here to report that a car sponge is now my most comfortable, lightest and cheapest pillow!

The only downsides are its size and non-compressibility. The biggest car sponges I could find online still required some getting used to, since you can’t just roll around and have your head stay on it like with a bigger pillow. But while I could never adjust to how uncomfortable all the UL pillows I’ve tried were, it only took me 3 days to not roll off the sponge anymore (and if I do, it means I’m fast asleep and don’t realise it anyway).

It also doesn’t compress much and basically takes its full size in my pack, but still works fine within my 58L system.

Sponge pillows probably won’t be for everyone, but at around 1.2oz/36gr and 4$/3.5€ a piece, plus whatever fabric you want to put between it and you face, I just think it’s really worth trying. Worst case scenario is that you don’t like it and have a sponge to use in your house.