The bag itself works great 100% water proof we can prove that because this thanks giving long weekend we went to our camping trip and on our way to Bon echo provincial park the rain was so heavy i was so worried that our things on the top of our car will gonna get wet specially we fully pack it and cant even closed the velcro but when we reached our destination the things inside our bag was all so dry. THeyre fantastic to work with, quick to respond, and happy to make the customer happy. The design of the rack also does not have backing. battery life is very good. Im in love with this mechanical keyboard. I will give them credit in that regard - the customer service was quick and helpful. For what I paid I expected better. However, I never had issues with my knees ankles or back when I wore them. Thank you for the suspenseful rides I go on reading your novel. For now, these are about as awesome as my ears need to stay very happy.