Crocheting in the 3rd & 4th loops creates a lovely ridge while maintaining sturdiness and durability.  I use this technique in my Northern Forest Tote Bag pattern.

I'm pretty new to video making, but I did make a quick video showing how to single crochet into the 3rd and 4th loop.

Be kind - this is my first go at something of this nature - but I sure hope it helps!