I have made about 10 jumps from 30000+ from a with my wingsuit and lots more without… When I jump with the wingsuit I use a 1 liter bottle with air for 20 min. I mount my bottle right under my boc with a pice of string and the hose goes inside my suit up to my mask. It is no problem to have the bottle under the boc because when you deploy you get the space for the bottle between your back and empty container. Ok it is cold up there but I don’t use more cloth than a 13500 jump. The time it is really cold is just for 1 minute and then it’s get warmer. We used 5 logtracks but they have never worked so I don’t know the real time butt people on the ground says around 6 min. When we are jumping from 30+ we have to pre breath for 2 hours otherwise the risk for bends is high. Many people can’t go up to 30000 with oxygen so it’s I good idea to talk with a doctor before. If you have a small hole in your teeth you can be in big problems because when the air expands the air get caught and on 30000 feet it will be so much pressure that your teeth can just explode and you will probably faint from the pain. I was in a test chamber before my first jump just to test how my body would react, and I had to take of my mask off on 26500 feet and you could see how fast you lost control over your body.
