These easily fit my size 8 - 8.5 shoes, including joggers and heels. They also fit my partners shoes (size 10 - 10.5/42). Keep them clean and separated in luggage, but the bags don't add extra bulk. The hook is quite useful for storing the bags (empty) or hanging them up in a change room.
These are fantastic. I bought a set for myself and my mum. My partner and I took these all over the UK on holidays as well as various small trips. They fit hiking shoes, multiple pairs of ballet flats, sandals or thongs. They are amazing value for money. I highly recommend.