I have only just found this thread so sorry if I am a bit late but the point of the suitcase fuel funnel is that holding twenty jerry cans while they empty is very hard on your back. Just up-ending a full can into the funnel is a luxury. A non folding funnel would take up more stowage space and get full of dirt when not in use. Us Brits may be crap at production engineering but we are good at ingenious devices.
Tim, these are not too hard to find in the UK, just keep an eye open at Malvern / Stoneleigh and Ebay of course. The rubber hoses sometimes have old age cracking but there are good ones out there.
David
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