Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great design but one major flaw.

I purchased this product for one good reason. There is no bear or duck or a backpack on the back side.The reason we wanted this product was that my 2 year old kid was gona travel with my wife alone. I thought I could just let him wear the harness through out the travel and so the toys on the backside would not bother him, plus the cost $6 was worth a try.But, the lower strap that goes around the abdomen is secured by Velcro. We put it on and it took him less then 20 sec to take the Velcro off. We put it again and then again it comes off.This was unsafe, this product only gives a feeling of security but it will not hold all the time.