How can you see how much bar/psi you have left if the gauge is on your back?

For the S400 series, we recommend that you carry the bag on your chest to check the pressure gauge. If you don’t like this, I suggest you buy the latest S400 PRO, this one uses an extended pressure gauge and a waist pack, you can check it through the extended pressure gauge.

Is this a disposable mini scuba tank?

no we bought this one on purpose so we can refill it

What about buoyancy? how can you control your buoyancy without bcd? will the tank drag you down?

I deleted two answers... A filled tank (200 bar or 3,000 psi) - may it be S700, S400 1.0L or S300 - will go down to the bottom. It has a negative buoyancy. An empty tank won't ascend from the bottom, but it will take an upside down position, its buoyancy is much less negative. Attached to you it "might" affect your buoyancy, but that depends on your own buoyancy. Buoyancy control depends on your buoyancy, and that from your weight, bodyfat ratio, gear weight, salinity etc.

Are these air tanks allow on planes

Yes, if you can show that the first stage regulator is unscrewed from the tank. Airlines are concerned with pressurized tanks.

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🌊 Dive Deeper, Breathe Freer — Your Mini Oxygen Lifeline!

COMPACT POWERHOUSE - 1L tank delivers up to 340 breaths, perfect for quick dives or emergency backup.
RAPID REFILL READY - Fill your tank in as little as 8 seconds with SMACO’s high-pressure adapters or hand pump.
DIVE PREPARED ANYWHERE - Comes with a convenient cloth bag—your compact companion for spontaneous underwater adventures.
BUILT TO BRAVE THE DEPTHS - Crafted from aerospace-grade aluminum alloy for superior corrosion resistance and durability.
BREATHE EASY DIVE CONFIDENTLY - Constant pressure air outlet ensures smooth, effortless breathing underwater.

The SMACO S400 Mini Scuba Tank is a 1L oxygen cylinder designed for 15-20 minutes of underwater breathing, featuring a constant pressure air outlet and explosion-proof valve for enhanced safety. Made from aerospace-grade aluminum alloy, it offers corrosion resistance and durability. Compatible with high-pressure hand pumps and SMACO refill adapters, it enables quick refills, making it an ideal portable diving and snorkeling companion.

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