Shoes are a paradox - they might be funky, sometimes beautiful, and fun to shop for, but when it comes to packing, trying to fit them into a suitcase is like trying to solve the Rubik's cube! They take up space and weight in an already cramped case, but shoes, especially sneakers, can be utilized to the maximum when packing - they are really helpful for storing small things like watches, socks, and underwear.
Roll up socks and underwear for inside shoes, place with soles to the sides of the case, and then place shoes inside a shower cap to avoid them dirtying up any fun vacation outfits.