Enquiry for lifting device

Guy received this letter asking for help recently, I have typed it out, so the spelling mistakes might be mine ( Dan ):

Dear Mr Unwin,
I was reading about you and your inventors club in this weeks amateur gardening mag. and I wondered if you or one of your friends could make a hydraulic lift to enable me to lift a 80l. bag of compost up to waist height? I cannot lift one up alone and if I open it up, upright, I have trouble bending down as it empties. It would need to be small enough to fit in my shed. Apparently there is a commercial version, there is not a domestic one. So if you can put your heads and spanners together I would be very pleased
Yours Mrs R. Watson.