Kingdom Death: Monster may be my biggest if we're counting the volume of both the game box and the miniatures box. If not Twilight Imperium is big but I think the big Galaxy Trucker-and-expansion in one box is taller and might be bigger overall.

Smallest for me is probably Codenames. Unless Set counts.

Shogun big box and for the smallest probably paku paku

Wait.. does French edition Root have bigger box?!

My biggest box is Sonic Battle Racers because I got additions from a bajillion stretch goals met on the mid-range kickstarter tier. Box Size comparison with a Mega Drive From Reddit

My smallest is probably a travel size cribbage board, if that counts.

This is what Complots looks like btw

Biggest by weight is probably wingspan with 2 expansions in the original box.

Smallest is maybe Saboteur.

I avoid giant boxes of minis so my biggest is A Feast for Odin. With the expansion it's a pretty full box and I love every bit of it.

Smallest is probably Squire for Hire or Dragons of Etchinstone. Small deck games like the Buttonshy ones but in more compact folding envelopes. I also have a few Pack O Game games: DIG, ORC, BUS, maybe those are smaller by volume.

Biggest is Fractal: Beyond The Void, smallest is Bohnanza.

Biggest one is Last Night on Earth 10 Year Anniversary Edition, and smallest is One Deck Dungeon.