Commercial Kitchen Equipment

I asked a question a while ago about "circular-needle" patterns for a bag, and was given good advice on just winging it and using a magic cast on, which worked perfectly! Anyhow, I've finished the bag. It's gray, with a purple-ribbed top. The bag itself does not stretch much vertically, but horizontally it stretches a lot more, which is what I was after.

Anyhow, I'm wondering what the least stretchy knitting stitch would be (ie. garter, stockinette, moss, seed or any others I could learn) because I'd rather that the handle didn't stretch a lot.

Thanks a lot!

By the way, I'm only fifteen, but I'm quite capable of learning any new stitches. Oh, and I'm not felting the bag or the handle. Any suggestions, even if they aren't knitting (ie. braiding) are very appreciated! Please don't suggest buying wooden/leather handles though, because I've already looked into those and none of the colours really match gray and purple.

Thanks again!!