Yes but these are from Truma/BP and not refillablePaulA
Clear, or at least, tranlucent gas bottles have been available for over two years - www.mthautogas.co.uk have been importing and selling them. I have a 'side' gas locker so use the 5kg size, which weigh 3.5kg empty so, if you don't see MTH at a Show, nor live near the Forest of Dean, they can post them to you !