I have a VERY active DS- very determined and no fear. Would run where HE wanted to go regardless of where we were. I went to buy one of those back packs and was virtually harassed for putting my child on a 'lead'... People just don't understand that for me it was a nicer way of keeping him safe. He won't even go in the pram or trolley, and definately won't walk along side you.

For us it was a matter of safety.