A very dense crochet stitch is the Base Linked Single Crochet, whereas there are two stitches in each stitch, except the first stitch in a row. You would want this for items like bags, rugs and items where durability is essential.
You can also use this for projects that require added weight, such as a weighted blanket. It thickens up the work.
The Crochet Checkerboard Rug uses this stitch. The rug has stripes of blue and white. Once a strip is done, it is sewn to the next strip. It is also double-stranded, which will make this a very dense stitch rug. It's why the stitches pop off the project, due to the double-stranding.

Don't use this stitch with combinations such as stitch samplers, as the tension is unique. With the amount of yarn needed per square inch, it won't work well with other stitches. I would even say this wouldn't work for the Base Linked Double Crochet Stitch either.

Abbreviations
- Ch = Chain
- Rep = Repeat
- Sc = Single Crochet
- Sc2tog = Single Crochet 2 Together
- St = Stitch
- Yo = Yarn Over
Instructions
Chain the length you need. The count is not essential, as there are no stitch multiples.
TIPS:
- Each stitch, except the first stitch in each row, is always used twice to make the stitches more dense and heavy.
- If you do not put in the extra single crochet at the end of the row, you will be missing a stitch, and the decrease will start.
1st row: Draw up a loop in 2nd ch from hook and in next ch, yo and draw through all 3 loops on hook (equivalent to sc2tog), *Sc2tog using last leg of the last ch and using next empty chain. Rep from *. across. 1 sc in last st that already has the last leg of the last sc2tog in it. Turn.
2nd row: Ch 1. Sc2tog using 1st and 2nd stitch. *Sc2tog using last leg of the last st and using next empty st. Rep from * across. 1 sc in last st that already has the last leg of the last sc2tog in it. Turn.
Rep the 2nd row until you are satisfied.
Crochet Diagram
You can download / print the crochet diagram.

Tutorial

Melissa says
I'm going to give it a go and make a rug.