10 Expert-Recommended Oxygen Concentrators for 2025: Reliable, Affordable, and Easy to Use

2. Inogen One G5

Best For: Active lifestyles
Specs:

• Weight: 4.7 lbs (2.1 kg)
• Battery Life: 4.5-13 hours
• FAA-approved for air travel

Pro Tip:
It runs on a rechargeable battery that lasts up to 13 hours (with the double battery), and yes—it’s FAA-approved for air travel. That means you can bring it right onto a plane without hassle. Many users say this machine gave them their independence back, and that’s pretty priceless.