SodaStream is at home water carbonator. It uses (smallish) 410g CO2 bottles. I have a large 20 lb CO2 tank and adapter that I used to refill my bottles.

For 99.9% of owners they have to ship it back to SodaStream (or a third party) to receive a refilled one. The cost is around $15-20 per refill. It costs me maybe $.50 to refill it with my large tank and takes about one minute. I own six small 410g bottles. So what I’m thinking is someone messages that they’d like to do a refill, then drives to my house and gives me their empties and I hand them fulls. I understand I’d be giving out my address to the public but it’s a small town and I would be direct messaging them it (not posting it). I could also offer to drive and drop off bottles for a fee. I work remote so I could do this 7 days a week.

Is this a reasonable (very) small hustle? Even 5 bottle would be $47.50 profit per week. The only issue I can think of is that if I give someone a bottle and they somehow managed to rupture it and injure themselves, with either the cold gas/liquid or metal fragments, they could go after me. But it seems other companies don’t consider that a significant risk as they ship them all the time. If there is enough interest and it’s continuous business, I could start an LLC and look into some type of broad umbrella insurance.