The inside is insulated. I bought it to put my lunch in, but I haven't used it much. I think the condition is good. The inside of the metal fittings is slightly chipped (photo 9), but it's a part that's almost invisible when in use, so I don't think it's that noticeable. Flat lay: Entrance: 30cm wide, 30cm high (about 22cm high when folded) Gusset: 20cm wide, 12cm deep