We just have one of those "Coles Liquorland" soft carry bags that has dividers, fits 6 bottles [usually just enough for a weekend away LOL] - the wine travels in the 4by, not the CT and has plenty of stuff around it. Never had any troubles.
Have seen where some people use plastic poly pipe [sized to the bottle] or there are many business's that have promotional "stubby cooler" type bags for individual bottles.
White wine travels well packed in lots of ice.