Oh, I just thought. Plastic bags in hostels were the most annoying thing ever. At 3 am, when someone else was packing for a flight, or even at 7am when you're trying to not be awake. Or at 10pm when you're trying to pack quietly. Some form of cloth bag, like a pillow case is probably useful. Maybe a couple of them, for underwear & laundry will come in handy.