Not sure what your budget is but the Rapha Cargo Core bibs are pretty great ($150). Pockets are deep but don’t have a ton of volume. You could probably fit a phone, multitool, and 5(?) gels. But a lot more if you utilized the thigh pockets.
I also have a pair of The Black Bibs Ultimate Adventure Bibs ($85). Maybe not quite as good as the Rapha’s but they are really good. Same as above with deepish pockets but they are pretty flat which is good that they don’t flop around but they also don’t expand a ton to fit food for all day rides.