yuwell42L Portable Emergency Oxygen Bag (Bag empty)

I love this thing!This is a great accessory to their oxygen concentrator at Amazon.I set the machine at 1 LPM at 90% concentration to fill the bag with 42 liters of 90% O2 in a little over a half an hour. You can stop to take a breath from the bag or machine occasionally while filling it.Sometimes when I go to the bathroom, or during projects, or when I'm having a bad day, 1 LPM at 90%, 3 LPM at 40%, or 5 LPM at 30% from those small concentrators just isn't enough & can't keep up during those difficult times.I lean my weight onto the bag to squeeze out a few breaths at 90% to catch my breath or get some relief faster. You can take as many breaths per minute at 90% O2 concentration you want until the bag runs out. We breath about 750ml (0.75 liters) per breath.Just a single deep full breath at 90% really gets your blood O2 level up fast, to recover quickly. Maybe get a couple bags so you can get a some emergency concentrated O2 if you need it during a power failure. I keep my huge O2 bag tucked right behind my big computer monitor in my bedroom. I'm thinking of getting a second one to keep on top of the fridge so if I need extra while working in the kitchen or going to the bathroom (fridge is near the bathroom door).I have a couple cats so was afraid they'd poke a hole in it. That's why I figure behind the monitor, or on top of the fridge where they don't get at it, but is easy for me to grab in a hurry. They're pretty durable & not thin or flimsy, but I don't think they'd be immune to sharp cat claws. They also can be used as a nice huge pillow or cushion if you don't have to worry about cats... except they're big ugly blue things that look more like a swimming pool float when inflatedDo not over fill them to the point they explode! Do not walk away when they're getting near full. From nearly full to almost bursting is in just a short time. So you want to sit with it & monitor it when it's getting full. Don't forget you're filling it or doze off, or you'll blow it, or over-pressurize the machine damaging it or the hoses. You don't want to damage a $300-$3000 machine. You can fill it until it's rather as firm as an air pillow or mattress would be, but no more!Update 3/17/18: I just bought 2 more. 1 stays behind the monitor in my bedroom workspace, 1 stays on the fridge, & 1 stays in the bathroom. I forgot to mention these bags, like most oxygen hoses smell strongly like plastic when new. You must run O2 through them a lot first to get rid of the smell. I set my O2 concentrator on 5LPM so I can fill it quickly, then fully empty it. I find I have to fill & empty a brand new bag 4 or 5 times before the plastic odor is almost gone. However, if the bag is new, if O2 is stored in it & not used for a week the smell will return. When it's new, you must use it a lot at first to get rid of the smell for longer term storage.My first bag is a couple months old now, so has no plastic smell if the O2 has been left in it for a week. However, it's probably not a good idea to let it set unused a very long time so the air gets stale. I find just refreshing it to replace what I use up in it, keeps the air cycled inside good enough. So if you're using more than 1 bag, rotate them so they all get cycled. If you are not using them, drain them out completely & refill them with fresh O2 every week or 2... especially if the bag is still new because the plastic smell will return during long-term storage until you've used it a while.Do not use a concentration of 50% or less of O2 in it. Use concentrations of 50% or more so you don't risk bacteria growing in the bag. Bacteria dies in totally dry high concentrations of O2. Do not use a humidifier or humidify the O2 while filling the bag. You don't want moisture stored with your O2 & risk bacteria growth. I use dry O2 at 90% concentration. That works fine & is safe.

Very good travel product.