There are several reasons to decant wine:

Older mature red wine vintages that have sediment collecting in the bottle. Use a funnel with a screen, to trap the sediment as you pour into a decanter. Some find it unpleasant if sediment reaches their mouth.

Young wines that contain strong tannins.  As you pour the wine into a wine decanter, the wine will have a chance to open up and breathe.  This will soften the tannins and open the bouquet of the wine.

If wine is a little cooler than you like - decanting can help warm it.

Try a test taste.  Pour a little wine in stemware and then decant into a lead free crystal decanter.  Try the wine in the glass. Wait for a half hour and then taste the decanted wine.  After it has been aerating in the decanter for an hour, try the wine again.  As the time increases in the decanter, there will be noticeable changes to your palate and the nose of the wine.

We have divided the decanters into three categories to make it easier to find the size of decanter you are looking for.  Single Category will accommodate one bottle of wine, Double/Magnum will nicely accommodate two bottles of wine and Magnum Plus will hold more than two bottles.

Note:

One Wine Bottle = 750ml which is approximately 26 ounces

Two Bottles or a Magnum = 1.5 liters which is approximately 52 ounces