A+ B and F can quality
I ordered these and had sent to Vail Colorado for our 8 day ski trip since I struggle with high altitude. The first can was full and worked so well. The second can was not full - about 150 breaths when it said over 220 per can. The third can had the plastic top broken and there was a leak around the plastic where it connects to the can, so the oxygen squirted out the side. Pretty useless. I threw is away. Would like better consistency with the product! Note: the cans were sealed together in the box but there was minimal packing with one sheet of brown paper stuffed in the box. For a $50 package, it would have been better to use bubble wrap to protect the cans in the box.