You may not need a bag if you don't often take your Yoga mat out and about. However, for the times you do, and you know how heavy a good-quality yoga mat can be, this Mat Strap from Yogamatters is perfect.

With adjustable loops to slide your mat into, this yoga mat strap is a perfect combination of convenience and functionality. The length allows for carrying across your chest or over the shoulder. 

Once you've arrived at your destination, the strap doubles as a yoga belt to extend and deepen your poses. What's not to like?

*Please note that the yoga mat in the picture is for display only.*