A sound suspect when shake your bottle?
The one answer on www.quora.com is there’s sound suspect when vacuum insulation was failure inside the double walls of the stainless steel bottle, it is one of the reason why vacuum insulation failure of the bottle to stop working to keep hot or cold.
There’s a getter welding to maintain the vacuum insulation of the stainless steel bottle constantly inside of the bottle bottom which is invisible, if the welding is poor during the manufacturing process of the stainless steel bottle then the getter will come off and you can hear a sound suspect when shaking your bottle, it means your bottle will stop working to keeps cold whatever.
A dent on your bottle?
There’s a vacuum insulated layer between the double walls of the stainless steel bottle to keeps cold or hot for hours, it’s how vacuum flask bottle works, although the stainless steel bottle is durable as it claims, but it might have dent when drop it on the floor by accidentally, when the dent is big enough to cause the double walls have contact to damage the vacuum insulation, that would makes your bottle stop working, and it’s no way to repair, you have to buy a new one.
A poor welding of the getter to cause the getter come off problem inside of the stainless steel bottle to your stainless steel flask stopped working, you can hear a sound suspect when shaking your stainless steel bottle flask, it’s quality defect of manufacturing that you can require a refund or replacement from the stainless steel flask manufacturer where your bought it; A dent when you drop the bottle to the floor by accidentally could make the double walls have contact to damage the vacuum insulation of the stainless steel flask bottle especially the dent is big, it could be your problem to take the responsibility or it could be the design failure which has no enough protection of the bottle to cause the dent damage easily happen, that you can leave your question here to get our technique support or contact us directly to get a answer what kind of protection should a stainless steel bottle has.