Instruct: Classify Amazon reviews into positive or negative sentiment
Query: unhappy in ohio

I was so excited about getting this back pack after reading the reviews...and utterly disappointed after purchasing it. Although my one year old (24 lb) son enjoyed it, it was very uncomfortable to wear. The weight was mostly distributed on my shoulders and it gave me muscle tension headaches after prolonged use. This may be good for short trips, but I wouldn't recommend it for hikes longer than a couple of miles.