I'm too cheap to spend $600 on a bag, so I made one myself and here's the pattern.

Image description: a professionally taken photo of a woman holding an unbleached cotton crochet bag.
Image source:  Pinterest

This is a really cool bag* I discovered on Pinterest.  It's SO chic and totally fits my aesthetic (haha, how bougie does that sound?), but since I am loathe to spend money unnecessarily and because I can crochet rather well, I decided to make one instead.  If you'd like a bag like this and you can crochet (or want to learn), here's the pattern for you.  For free!  No strings attached!  

Image description: my son holding an unbleached cotton crochet bag.

I do want to say one thing -- this bag took me 20 hours to make, so the $600 price tag is really not ridiculous. 

I have tested this pattern myself, but no one else has tested this patten, so if you think it contains any errors or needs some clarifications, please let me know!

Please read through everything before beginning the pattern.

You will need: 
• F5/3.75mm crochet hook or size needed to obtain gauge
• yarn needle to weave in ends
• 5 balls of 70g/110m Sugar & Cream yarn [Doesn't have to be this brand, but it should be cotton (or linen or jute or another plant fibre that won't stretch -- quirky ones like paper will probably be fine, too) and "category 4" weight, like worsted or aran or else you will need to use a differently sized hook and your bag will turn out a different size.]

Gauge:  18.5 sts x 18 rows = 4"/10cm of sc worked in the round in a spiral (exact gauge is not hugely important, but you want your work to be tight)

Intro:  Basically, you are going to crochet a flat circle to a certain diameter (this is the base of the bag, like a big crochet plate) and then you are going to continue to crochet in the round a bunch of times so the outer edge of the "plate" will kind of curve up into the side of a cylinder.  We're leaving some gaps for the handles, then continuing the cylinder until the end of the bag.

I staggered my increases so the shape of the base stays circular, because if you do, say, 8 increases per round for a great number of rounds, the shape will end up a bit octagonal.  This is not a huge deal, just a matter of personal preference.  If you don't like the way I did the increases, do them a different way.  As long as you end up with a flat plate-shaped piece with a diameter of [x=144/162] stitches at the end of round [y=21/24], you're good to go.
If you want your bag to be smaller, stop increasing sooner and if you want your bag to be bigger, add more increases at the end of the increasing section.
If you want the bag deeper, do a few more rounds before you make the handles (round 60/70).  If you want the handles wider or narrower, adjust the number of rounds after round 60/70.
Want longer handles?  Ch a few more stitches in round 60/70.

Image description:  A smaller version of the crochet bag with longer handles in variegated green/purple cotton yarn.

This pattern is so easy to customise.  I've added photos of other bags I've done all in the same way, but differently sized.

Notes: 

You will be crocheting in the round in a spiral -- use a stitch marker to keep track of your rounds.  place your stitch marker into the last stitch of the previous round and move it up as you complete each round
After the first round (the magic loop round) begin crocheting over the tail until a few cm remain, then begin crocheting over a second strand from now on (this is a good alternative to weaving in your tail -- crochet over it until a few stitches before it is going to run out and then add a second strand -- for more information on this technique, google tapestry crochet) -- this will add strength and structure to your work.

Image Description:  A green and unbleached cotton striped crochet cotton bag. 

If you want to do the striped version, attach another colour (anywhere on the outer round except in the stitch you're working on in the original colour!) and start crocheting.  When you get to where the original colour working stitch is, start crocheting around in that colour until you reach the new colour again, then start crocheting in the new colour.  You are basically crocheting two spirals at once.  Keep going around like this for as much or as little as you like -- if you want to end the stripe before the bag is done, make your last stitch a sl st and when you get to that stitch with the original colour, you just crochet right over that sucker and then keep crocheting around in a spiral just like you did at the beginning of the bag.

Pattern:
Make a magic loop.
(Link to magic loop tutorial:  https://www.youtube.com/watch?time_continue=46&v=CMPPAfXez8Q)

Round 1:  6sc into magic loop.  Pull magic loop tight.
Round 2:  2sc into each sc -- 12 sts
Round 3:  *2sc into next sc, sc into next st,*  rep from * to * for one round -- 18 sts
Round 4:  *2sc into next sc, sc into next st,*  rep from * to * for one round -- 27 sts
Round 5:  *2sc into next st, sc into each of the next 2 sts* rep from * to * for one round -- 36 sts
Round 6:  *sc into each of the next 5 sts, 2sc into next st,* rep from * to * for one round -- 42 sts
Round 7:   *2sc into next st, sc into each of the next 2 sts* rep from * to * for one round -- 56 sts
Round 8:  sc into each st around.
Round 9:  *2sc into next st, sc into each of the next 6 sts,* rep from * to * for one round -- 64 sts
Round 10:  sc into each st around.
Round 11:   *2sc into next st, sc into each of the next 7 sts,* rep from * to * for one round -- 72 sts
Round 12:  *sc into each of the next 3 sts, 2sc into next st,* rep from * to * for one round -- 90 sts
Round 13:  *sc into each of the next 8 sts, 2sc into next st,* rep from * to * for one round -- 100 sts
Rounds 14-16:  sc into each st around.
Round 17:  "sc into each of the next 4 sts, 2sc into next st," rep from * to * for one round -- 120 sts
Round 18-20:   sc into each st around.
Round 21:  *2sc into next st, sc into each of next 4 sts,* rep from * to * around -- 144 sts

Make a regular size bag (like the striped one):
Rounds 22-59:   sc into each st around.
Round 60, the row where you make the handles:  sc 24, ch 24, skip next 24 sts, sc 48, ch 24, skip next 24 sts, sc 24 -- 144 sts
Rounds 61- 65/70:  sc in each st around.

Make a bigger bag (like the unbleached cotton one):
Rounds 22-24:  sc into each st around.
Round 25:  *2sc into next st, sc into each of next 7 sts,* rep from * to * around -- 162 sts
Rounds 26-69:   sc into each st around.
Round 70, the row where you make the handles:  sc 27, ch 27, skip next 27 sts, sc 54, ch 27, skip next 27 sts, sc 27 -- 162 sts
Rounds 71- 81:  sc in each st around.

To finish, sl st in next st, cut yarn, leaving a very long tail.  Using a yarn needle, wrap the tail of yarn through each stitch along the top round.  Weave in end.  You can do the same yarn wrapping thing around the handles.  If you don't want to do this, just cut the yarn and weave in the tail.

Image descriptions:  Top and side view of unbleached cotton crochet bag, sitting on a linen pillow by a window.

I use these bags all the time!  I've made four and am working on a fifth.  I take the unbleached one out with me (it's chic and practical) and use the rest around the house -- two hold kids books/toys and the other is a project bag.

*  P.S.  The original bag is by Lauren Manoogian.  Her bags and all her other stuff is amazing!  Check out her website here:  https://laurenmanoogian.com/