I thought of clipboard/cereal packet cardboard etc, but now I've seen the embroidery hoop in action, it works a dream! I nearly didn't pack the hoop as I was trying to pack 'minimal' but put it in at the last min. I was amazed that the characters can hold a pen and sign with such big "hands", never mind hold an autograph book, so knew the bag I had taken would be tricky. But the hoop was really great for them to hold onto, as it makes the fabric less flat. Definitely worth packing if you already own one!