SMACO Mini Scuba Tank 1L Small Diving Tank up to 20 Minutes Dive Time Portable Lung Air Tank Diving Oxygen Cylinder Kit for Underwater Exploration Emergency Rescue Pony Bottle S400

I have to say this is one of the best investments I’ve made for underwater exploration. From the moment it arrived, I was impressed by the compact design, professional build quality, and thoughtful engineering.The S400 provides up to 20 minutes of dive time, which is perfect for short underwater adventures, emergency backup, or even quick maintenance dives. It’s lightweight, easy to carry, and surprisingly simple to use. I really appreciate the constant pressure exhaust system it makes breathing smooth and consistent, and the explosion-proof design adds a reassuring layer of safety.The double-layer filtration system is another standout feature. The air feels clean and fresh, which speaks to the quality of this product. I’ve used it for shallow dives around 30 feet, and it performs flawlessly. Also, the fact that it can be disassembled and taken on a plane makes it perfect for travel and spontaneous dive trips.Filling options are super versatile. I’ve refilled it using a standard scuba tank and the 8mm adapter it only took seconds! Knowing I can also use a compressor or hand pump if needed gives me peace of mind.The harness included is comfortable and secure, and the whole setup feels solid and well-made. I wouldn’t hesitate to recommend the SMACO S400 to anyone who wants a reliable, portable diving solution. Whether for fun, emergency, or utility this tank delivers.

The SMACO Mini Scuba Tank (S400) is absolutely incredible! As someone who loves underwater exploration but doesn’t always want to deal with bulky scuba gear, this 1L tank has been a total game-changer.First off, the build quality is outstanding — it feels solid, durable, and very well-designed. It’s easy to use, lightweight, and super portable, making it perfect for quick dives, underwater photography, emergency backups, or just some spontaneous fun exploring reefs and coves.The 20-minute dive time (depending on depth and breathing rate) is more than enough for short dives and underwater tasks. I also love how easy it is to refill with a hand pump, compressor, or larger tank, and the detailed instructions made the whole setup process simple and stress-free.The emergency rescue potential of having this as a pony bottle gives me huge peace of mind whenever I’m doing deeper dives. It’s a serious safety backup that’s compact enough not to get in the way.SMACO really thought of everything with this kit. It’s reliable, lightweight, and surprisingly comfortable to carry underwater. I’ve already recommended it to several of my diving friends.If you’re into diving, snorkeling, or even just want an emergency air supply for boats, this is an incredible investment. Worth every penny!

It has a beautiful and very stylish design

Got the tank, tried it in the pool. Here is a quick review. It worked well in the pool, the regulator and tank functioned as it should. However, there are a few things that need to take notes of. First of all, it does NOT give you 20 minutes of air, not even close to. It's a 1 Liter tank, which is about 1/10th the size of a regular 80cf diving tank, so it basically gives you 1/10th of whatever your breathing time is with a regular diving tank. I can usually breath 60 min with a regular tank in a dive, so no surprisingly, this tank gave me about 6 minute +/- of breathing time. Also, if you do not want to invest in an electric pump, do NOT buy it. I used my PCP electric pump to fill it up and it took almost 20 minutes. Simply can not imagine pumping it with a hand pump, it may take you whole day to fill it up. And despite what some of these tank sellers claim in their pictures, this is NOT for beginners. Do not try to play with this out in the wild if you are not a certified and experienced diver. I'd only try to use it in very shallow water like no more than 10-12 feet deep, where I can make to surface right away in any emergency.

So I'm very familiar with pressurized gas and obtaining it due to my job (unique kind of welding). Due to liability reasons even though the air used in scuba is the same that comes out of a compressor one might use for a nail gun or sandblaster you need a scuba certification to get it filled. I was always under the assumption that scuba tanks contained some mixture that had supplemental nitrogen and other gasses added to make it safe but it just is compressed air. Looking back I might have just been told that when I asked why pure oxygen wasn't a viable option. This tank comes with a "certification" that says it has been tested but this is no more than a card the manufacturer made themselves and means nothing to a professional shop. So usually when you get any gas filled they need a hydrostatic test and inspection that's valid to make sure the tank is safe and clean enough to be filled with something you will inhale or something that if not properly contained would make as decently sized crater even if this accident happened on asphalt. This is usually a 25$ test at most and happens in a day, most shops with nice owners won't even make you do it as long as they trust the shop that the tank has been filled at before and most tanks that you fill have been around for 60-80 years. Sorry for this off topic fact but oddly enough most people who fill these for work have ran into 3-10 tanks stamped with the symbol commonly used by that the evil guy with the funny mustache. If you ever see a tank with 4 boxes it's because that's the easiest way to cover that up. So even though it's common practice to get a tank that was made before youre grandpa was born, those in the know would trust a tank from back then more than one made this year in China. Even though you can just hook a compressor up to these unless youve been instructed how to use one to breathe in a safe manner going even 10 feet under could be fatal. It's easy to assume that you just need to let the air out and breathe it in but without doing lung exercises and using proper technique there's a sliver of a chance the expansion that happens to your lungs could be fatal. So even if youre built different and can handle stuff like that I found that it was harder to get this filled than it was for me to get a tank of hydrogen when I was 17. I still might try it anyway because I'm also built different 😂 but I'm going to make sure I have a partner with me and talk to an experienced diver beforehand. Hope everyone who reads this gets to live out their fantasy of being a mermaid safely. This is not the best route.