This is a great harness.
My son is a large 20 month old and I have struggled to find other reins that fit him with a bulky coat on. This is ideal and still has plenty of growing room.
I wouldn't recommend this for children who are still unsteady on their feet but for children who you're not worried will fall over this is perfect.
The tail is long enough to push a pushchair and still give my son room to walk alongside without realising he's being "led". He loves putting on his monkey bag.
Talking of bags, whilst this has a pocket it's not vey big, it may be big enough for a snack but nothing else. I wouldn't buy it for the bag feature. Having said this I love it and highly recommend it.