Largest basket uses just shy of one skein - one more row would use exactly one skein.

These were sized to fit these corner shelves ($20 on Amazon): https://www.amazon.com/dp/B094XLDF2R

First you work the bottom, which is just a crochet triangle (specifically, a half granny square), and then you work in the back post to turn the stitches 90 degrees, so you can continue working upward in rounds for the sides.

Finished size is 14” wide across the front (longest side), 8.5” deep from front center to back corner, 11” long each short side, 3.25”(3.75”)(4.25”)(4.75”) tall

1: in magic ring, ch4 (counts as trc), 2 dc, trc, 2 dc, trc. Ch4, turn.
2: 2dc in same st as ch4, dc in ea dc up the side, 2dc-1trc-2dc in trc at top corner, dc in ea dc down the other side, 2dc and 1 trc in top of ch4. Ch3, turn.
3: 2hdc in same st as ch3, hdc in ea st up the side, 2hdc-1dc-2hdc in trc at top corner, hdc in ea st down the other side, 2hdc and 1 dc in top of ch4. Ch3, turn.
4: 2hdc in same st as ch3, hdc in ea st up the side, 2hdc-1dc-2hdc in dc at top corner, hdc in ea st down the other side, 2hdc and 1 dc in top of ch3. Turn the work sideways so you’re working across the long edge of the triangle. SC across that edge, spacing sts evenly so that they’re neither stretched nor bunched; you should end up with ~21 sts across. Do not turn.
5: bpsc in each st around
6: sc in each st around
7-8(9)(10)(11): sc through center of each st around (insert hook between legs of st). On last round, decrease one at each corner (to make top edge of basket a bit more rigid). Weave in ends.