Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Sturdy but useless for a hammock

I bought these straps to suspend a hammock. I tried everything to keep my butt from hitting the ground to no avail. (I'm only 160 lbs, so I really didn't think this would be an issue).I even mounted them at a height of 6ft (they recommend 4.5 feet). My arms were shaking like an olympic athlete to secure the straps because I was trying to get them as tight as possible. The second you put any weight on them, the straps flex and your butt is on the ground.I messed around with these things for over an hour on my trees so I can't return them now. Hopefully I'll find some other use for them but they are way too flexible to be used as a hammock strap as described.