We are very common glass bottle, see how much you will find at the bottom of the bottle will bulge, are you, or do not have reason deliberately designed. The bottom of the bottle glass bottle bottle production projections for the first such nice glass bottles, wine bottles make a three-dimensional sense of depth, and the second is for less loaded drinks, in fact, we say this is a pound a bottle of wine, But most of the winery installed 450ml, in fact, nine volume, a consumer means winery, nine more would amount to enough to drink a bottle. In fact, there is a reason for this is the bottom of the convex glass bottles for safety inspection, bottom protrusion on the bottom of the bottles need to be thicker, so that a bottom is very strong, not fragile, after it raised center portion of the bottle with air, when the bottle in place, there is an air resistance, increased firmness bottle. www.xinbabaozhuang.com