I just ordered a fig tree from a nursery. I should get it around July 11th. It will be sent bare root. Is it a good idea to repot this in a fabric grow bag. I will need to move it in the winter for protection. I have not heard or seen any fig tree planted I one. Just needed some items before I purchase something.

I found that no matter what kind of plant, the roots need to be well established and stable when I put them in fabric pots.
Fabric dry out much quicker than any regular pot even with bark mulch on top. I have 3 figs a little over 1yr old from cuttings in fabric pots with saucers on bottom now, lighter to move but they dry out and droopy leaves faster than ones in plastic nursery pots without saucer bottoms since they can lose moisture from all sides to heat or wind. I'd use regular at first and fabric for the up-pot.

Forum member ross uses fabric pots with great success, they help with root pruning. Maybe send him a message he may have some advice. Check out his youtube video channel he has a bunch of helpful stuff on figs.

I love the air pruning aspect and I can carry with one hand while same size regular pot I struggle with picking up and storing.
Its just you have to be very diligent with monitoring soil and environmental conditions when initially placing in the grow bags, I lost a few plants of various types when I swapped up and they were well rooted, so a new bare root plant may need more "attention" to survive.
I grow herbs, melons, tomatoes, potatoes, peanuts and sugar cane in fabric grow bags all the time with great success, I even have my raspberries and blackberries in them outside for past 3yrs and get quarts of fruit a week. But I know I have to check soil throughout the day to water more often in my environment than plants in regular stuff.

I use fiber pots/bags almost exclusively when not using SIP containers. However, I do agree with comments above. The fiber pot tend to allow more movement of soil and roots (especially if you happen to drop them). I have not purchased bare rooted fig trees. But I do use standard hard plastic pots when I first pot up removed air-layers. The reason is for the initial added soil stability for the roots. I then up-pot the next time into larger fiber pots, and then 4 or 5 gallon SIPs later.

I would stick with standard pots for the first potting of a bare rooted tree. Just my opinion.

CliffH

What is the best size pot to repot in to? Should I pot in the size want permanently? Or one or two sizes larger then again. In 2 year until I get it I the size needed?

You really wont know size for first pot until its delivered and you see root configuration & what it'll fit into. After it settles, how fast it grows will let you know what size.
But when you change to fabric pots, a lot of the roots grow into the fabric and get tangled/locked on. The fabric doesnt stop them, the air on the other side prunes them. You may have to cut away a fabric pot just to free the plant in future as I did. (look for strong, sturdy but not expensive) Other pot/plants I have re-used after empty and sun dried roots, I brushed out then washed just fine.

I have a bunch of 20gallon ones.
I plant tomatoes,potatoes,cucumbers in them,there great.
I use the brand High Caliper.Those things must be around
5 years old.They have been drug all over the yard and back.Ive never had a problem with rips or damage to
the material,their thick.