Container Size Recommendation

[Mithril]

I just placed an order for a 1 Gallon XL 'Hime Shojo' JM and have no idea what *size* that "means" so I wanted to see what size pot(s) y'all would recommend I get to give it the best home possible while I'm waiting for it to arrive.
In other news, my first bonsai (Ficus, Bald Cypress and Water Jasmine) are still alive! I mean, I haven't snipped so much as a leaf off of any of them but the fact that they haven't all perished and it's been a good month is a step up for plantkind.
I'm starting to get tools in so I'll keep working up my bravery and beating back my trepidation. This site has been a tremendous help.

 

[penumbra]

A standard 1 gallon nursery pot holds about 3 quarts and is a bout 6 inches in diameter and about 8 inches tall. Gallon XL, is the growers designation that the plant generally fills the pot and is close to being ready for a 2 gallon nursery trade pot. You really need to receive the plant and evaluate its root system before you consider re-potting. If it truly does fill out the pot, you may want to slip pot it into a 2 gallon pot, or possibly even larger. This being the heart of summer, I do little re-potting except for tropicals. But if a plant is pot bound and I have concerns about it drying out, I will slip pot into a larger pot. But this action depends almost entirely on what I envision for the plant to bonsai transition.
When you receive your maple, put it in a shady spot and water it. Transition it to more sun over about a week to prevent sunburn. You may get a more precise answer here if you post a picture of your maple once it has been received.

 

[Mithril]

A standard 1 gallon nursery pot holds about 3 quarts and is a bout 6 inches in diameter and about 8 inches tall. Gallon XL, is the growers designation that the plant generally fills the pot and is close to being ready for a 2 gallon nursery trade pot. You really need to receive the plant and evaluate its root system before you consider re-potting. If it truly does fill out the pot, you may want to slip pot it into a 2 gallon pot, or possibly even larger. This being the heart of summer, I do little re-potting except for tropicals. But if a plant is pot bound and I have concerns about it drying out, I will slip pot into a larger pot. But this action depends almost entirely on what I envision for the plant to bonsai transition.
When you receive your maple, put it in a shady spot and water it. Transition it to more sun over about a week to prevent sunburn. You may get a more precise answer here if you post a picture of your maple once it has been received.

Thank you so much! I thought about that at the end (wait until I get it) so I'll do that and it makes sense not to knee jerk repot because boy it's hot. Thankfully the tree is coming from nearby NC so it shouldn't be too shocked here. Famous last words.
That's perfect information though about the size dimensions as I love to overthink. Thank you for that information as well.