The D&D 5E DMG says that the Bag of Holding is 4ft deep. To me this means that the bag is 4ft tall, but I'm wondering if that is simply on the "inside". Though that would mean that items put into the bag can only be 4ft tall/wide depending on which way you put them into the bag. Though, that doesn't quite seem right to me.
In the same sentence the DGDMG says that the mouth of the bag is 2ft wide, which means that the mouth of the bag can open up for something 2ft in diameter. It's a dimension for the outside of the bah, which would suggest that the 4ft deep aspect is as well. So does this mean that the bag is 4 feet tall?