Hi! Prior to COVID, I traveled weekly, so that's a lot of shoes in luggage case.
I put my shoes in the Chanel dust bag and then in my luggage case.
The key to storing shoes in my luggage case is to put them on their side, like how they come in a show box. I do not put them facing up (soles down) as they get squished more that way. Putting them on their side will help with them being squished from the top. I also put the sole of the shoe on the edge of the luggage case (think super size shoe box where the shoes are stored on their side).
When I return from travel, they will always be a bit squished, but no worries. All I do is put my feet in them for a few seconds to get them to puff back up. I then place them on my shoe display rack. I do not use shoes trees.
I used to use shoe trees, but I stopped. For me, I felt that with a shoe tree, the tension of keeping the shoe taut, even if it's slight tension, stretches them ever so slightly and I did not like that (that's how cobblers stretch shoes, via tension). If you don't use any tension, then there is no point to using the shoe tree as it's not even touching the leather.
For me, I find the the best solution has been to:
- Store them on their side in the luggage (the way shoes come on the side in the shoe box). This is the secret sauce in my opinion.
- When you take them out of your luggage, put your feet in them to puff them back up
- Store them normally, no tension shoe trees
That's just me.
By the way, I used to put a sock inside my shoe for travel, and yes, they do not get squished as much. However, since I started to put my feet in the shoe after I took them out of the luggage case when I returned from travel, I stopped doing that. I found this little trick works the best to puff them back up. Leather just puffs right back up. If you feel more comfortable stuffing them with socks, that works too and no harm as there is no "tension." You can tell I am anti-tension on shoe trees.
That's my experience, and I do a lot of travel. My shoes never stay squished. Hope this helps.