O2 Blast 99.7% Pure Oxygen Supplement, Quick Recovery for Exercise, Motion Sickness, Altitude Sickness, Mental Clarity, and Focus. Custom Designed mask (9 Liter Portable Oxygen Can - 2 Pack- Natural)

They worked for what I needed them for. The way I used them was emptying the entire can into an empty (never opened) trash bag so the bag was full of pure oxygen. Then I added helium and could make my voice change for a very long time without needing to take a breath of fresh air. Cool stuff. I imagine you could do the same with any other gas that doesn't react with oxygen.

Bottle is large but used it only a few times and it's acting like it's almost empty.

Sorry, this seemingly is very poor product, my husband was hopeful it would help with oxygen in a singe breath. It has not been helpful, do not waste your money. Of all the items we have ordered from AMAZON HAVE BEEN WONDERFUL, but very disappointed in this one purchase. Tamara and Vern H.

LIKE HAVING THIS WITH FIRST AID PRODUCTS

Excellent product. Works exactly as claimed.

POSSIBLY, probably the most useless of a long line of useless products I have ever bought. It is honestly just air, not even good air it is scented air in a can. not enough oxygen in it to spike a flame. Buy this only if you really have more money than sense.

Helps me breathe better

first one were empty bc of the heat?the replacements seem fine