Question

what are the benefits of preserving food in air tight sealed tins

Answer 1

The vacuum bag keeps your food from contact with the air, so moisture cannot evaporate, making it an excellent barrier from the elements. The shelf life of your food is greatly extended when you vacuum seal it.Vacuum sealing food preserves it 3 to 5 times longer than food stored in plastic containers or bags

Answer 2

 The lesser quantity of oxygen left-over food gets, the better it is for its freshness. Food containers are designed specially for this purpose. They are air tight and sealed to prevent contamination of food.