Reddit reviews Pirate Lab Slice Box Deck Box (120-Card)

I ran into the same issue. I found a pirate labs box that holds 120 cards, fit my resealable double sleeved deck perfectly.

Link

Edit: it looks flimsy but it's actually pretty solid. Not as good as the boulders or satin towers, but much better than most flip boxes. It's got hard plastic underneath instead of the usual cardboard. I think pirate labs also has a bolder-like product, but they only hold "110" so it'd be much tighter

https://www.amazon.com/Pirate-Lab-120-Card-Slice-Black/dp/B0758YBCH3/ref=sr_1_1?keywords=pirate+labs+120&qid=1562198412&s=gateway&sr=8-1

These are the only ones that I have found that fit Perfect Hards and Dragon Shields, it's very comfy, and you have to squash all the air out, but they do fit fairly well.

Personally, I've gone with proxying the expensive cards and keeping the main cards in a staples binder, this lets me keep my edh decks single sleeved without worrying about the cards being wrecked, this isn't viable for everyone, but it's what worked for me.