So I was excited when I revived this backpack to help me through some of the pain; I assembled it and as soon as I lay on it the curved part flattened out, I tried all the different settings on it and each time the curved part flattened out. This rear subframe is supposed to hold up to 250lbs and I weigh 190lbs so yeah the only way to use this unit is to put tennis balls under the arch and then it kinda works I have to return it but that is more cumbersome than putting tennis balls under the archway. However. don't take it if you don't have tennis balls π
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