Yes, I have one and it was bought for Jed as he's quite lazy and I thought it might burn off a few calories extra. However, it's been used only a few times because the kind of walks my lot go on and the things they get up to means a back pack isnt practical.

We had the idea that he could carry our drinks and wildlife indentification books whilst rambling but the trouble was we'd die of thirst or the animals for ID would be long gone before we managed to get Jed back to us.

I got the 3 peaks one for Jobie, put it on as we were walking home from P@h and he refused to go another step despite not minding it in the shop