Need help please!

I have a 1 yr old and am pregnant with twins! I have gone through so many diaper bags I have not been happy with anything. My main thing is I need it to be a packpack style because I have scoliosis and two straps help. I am looking for #1 space and #2 durability I do not care about fashion 😅 anyway please please if you know a great diaper backpack please let me know!! Thank you so much!!

(I've tried the skip hop backpack it doesn't have enough room for 3 babies things 🙃)

❤🙏