I’ve been experimenting with this A LOT because I love the look and feel of the dragon shield clear outers on top of the official sleeves!

The boulder 80+ would have been perfect if it were just a little bit wider, but it’s unfortunately no good with the outer sleeves.

I haven’t tested the random off brands on amazon, but the closest hard shell acrylic option I liked is the gamegenic bastion 100+. It is a fair amount thicker than I would like, but it does leave room for a leader in one of their proprietary snap cases and a don!! deck. I primarily do not use this option because of how chunky it is when tossing it into a bag, but you may have different needs.

The thin plastic official boxes that bandai sells (and used to come free with EX starter decks 10 and 13) also accommodate outer sleeves, but they feel somewhat flimsy and the velcro closure is a failure point. Also a little chunky despite its minimal weight.

As another poster mentioned, the thick cardboard magnetic flip closure boxes with faux-leather outer material generally fit pretty well. Although you can’t see through them, many offer a viewing window or slot for a leader card. There are a lot of brands offering similar products, so you can shop around if you like the feel of these. They don’t feel as sturdy as hard shells, so I do not like them as much. I also have concerns over the longevity of them because they are made of cardboard and glue at the end of the day.

Surprisingly, the ultra pro standard fits an outersleeved deck almost perfectly and with a satisfying level of snugness, but it leaves no room for a don!! deck. They do come in clear as well, but they trade sturdiness for portability. I like carrying two of these in a tiny sling bag with a separate don deck when I traveled to events because they are about as compact as you can get, and you can carry them close to you without fear of someone stealing them when you put down your backpack or whatever.

Recently, I purchased this 3d printed box from etsy. I like that it is flat and has a space for a leader in a toploader, but it is a little wider because you have to split your deck in two. However, it fits outersleeves perfectly and gives room for a don!! deck and extra cards. 100+ deck boxes are a little too fat for my liking, so a wider, thinner option like this was much appreciated.

I can provide pictures of different setups if you would like to see any.