A good quality carton depends on the quality and weight of paper. if we only discern paper weight, I think it is very difficult!But we can ask the seller also cartons are marked with the name of the paper weight, size paper ridge ,it called corrugated paper.
In these aspects is much simpler! First, ask what kind of glossy if he does not, then there is no need to talk anymore!If sellers have said kraft inside and outside, and the price is very low .other sellers I can not jump to comment, but I was work in the carton factory,if the 12th kraft carton can be sold for 0.25 yuan, to be honest we really can not do this! If you want to choose a good quality then you ask grams of kraft. Selling the materials are similar, it will be able to separate the good and bad with the weight.
Three corrugated cartons which most selling,if you want to know the hardness then ask the paper weight and if he tells you 200 grams paper and still 0.3 yuan or less, tell me ah ha ha hurry, I have to buy it! !
The inside paper is also grams heavier the better the quality of the box.
When weather is wet and there are a lot of cardboard boxes in your hand,it is recommended to store in good ventilation and relatively dry place.Carton absorb moisture if stored inproper it will damp and also reduce the hardness of the carton increase the weight !