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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SMACO S400 Mini Scuba Tank, 1L Portable Diving Lung Air Tank | Aluminum Pony Bottle, DOT Certified, Reusable, for Recreational Diving, Pool Training, Boat Cleaning, Beach Vacation & Travel

Product ID: 251288595

⏱️75 breaths at 200 bar

✈️Airline carry-on friendly

🛡️Explosion-proof safety tech

¥70787

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌊 Dive Light, Breathe Right — Your Portable Air Lifeline!

COMPLETE DIVE PACKAGE - Includes 1L pony bottle and harness—ready to go for pool training, boat cleaning, or emergency backup.
BREATHE EASY DIVE SAFER - Constant pressure exhaust + explosion-proof design for smooth, secure air flow.
TRAVEL READY DIVE COMPANION - Disassembles for airline carry-on, perfect for spontaneous dive trips and shallow water adventures.
VERSATILE INFLATION OPTIONS - Fill your tank locally, via SMACO adapter, compressor, or hand pump—flexibility that fits your lifestyle.
RELIABLE AIR SUPPLY ON DEMAND - Delivers approx. 75 breaths at 200 bar with dual-layer filtration for pure, clean air.

The SMACO S400 Mini Scuba Tank is a 1L portable diving lung air tank designed for safe, reliable breathing up to 16 ft depth, delivering approximately 75 breaths at 200 bar. Featuring explosion-proof technology and a dual-layer filtration system, it ensures clean air supply. Airline-friendly and versatile with four inflation methods, it’s ideal for recreational diving, pool training, boat maintenance, and emergency backup.

Specifications

ASIN	B08HHHDSZT
Best Sellers Rank	#136,207 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #16 in Diving Tanks
Brand Name	SMACO
Customer Reviews	4.2 4.2 out of 5 stars (212)
Date First Available	October 17, 2020
Item Package Dimensions L x W x H	19.33 x 8.94 x 5.39 inches
Manufacturer	SEBiger
Package Weight	3.21 kg
Part Number	S400
Style	A-green
Warranty Description	1 year

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¥70787

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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