I used a set of AIM double convoluted bags, made by phoenix bag, on my 79 El Camino. It was my first bag job and I didn't know any better
. It only took 150psi from my shop air compressor to split a bag rated at something like 400psi. I never even got to drive it before I had to replace them. I would have been in real trouble if I had been driving it when it happened. Beware, you get what you pay for and your suspension isn't a good place to cut costs.