no, it's not tapestry crochet nor Tunisian crochet...it's just regular ole crochet worked in rounds, not rows....so there is no turning at the end of a row....I was watching some videos on tapestry crochet...that's what your basket/bag work looks like. Fascinating.
basically, make a flat place mat the diameter you want your basket by increasing a few stitches in each round until it's the right size.
Then to bring the sides upwards, on the first round of the sides SC in the back loop only, all the way around...
NOTE! you need an odd number of stitches in the round to do the next round and all rounds afterwards. So what I do is on the last round of the place mat like bottom round.... is leave out an increase stitch to make certain the stitches in that round end up being an odd number.
this next round, the stitch you see on the sides is single crochet (SC) and Long Single crochet (LSC)....
what you do for the LSC is instead of single crocheting in to the next SC loop, you single crochet in to the bottom of the next SC....making it a long stitch....
What this does is make the basket sides much stronger and thicker because it is doubling up over, every other stitch....
Also, I use 3 -4 strands of yarn combined together when crocheting them...
that, with the LSC stitch makes the baskets sturdy and durable and they will last a lifetime!!!