Currently the inventory lets you open as many of one type of chest/tile pack as you want, and it also lets you select multiple types of chests/tile packs to sell, but there's seemingly no way to select multiple types of chests/tile packs to open simultaneously. Especially considering how most tile packs don't stack with each other, it'd be really nice to get an "open all" button with multiple types selected, that way you don't have to wait for the opening animation 20+ times when redeeming things en masse.