Purchased five of these to try them out in Europe before some more serious adventuring in the US. Glad I tried before relying on them. They do not seal well, and there is a gap between the cap and the body of the nozzle. Additionally, the cap is fairly weakly secured, and the nozzle sustains sun damage fairly easily. Great idea, but needed better planning and execution. Since I am a fan of water bladders anyway, I will be sticking with regular caps on the extra plastic bottles I use to increase total carrying capacity.
