Learned about it through Reddit. Seems better than LighterPack (or GearGrams for that matter). Link. FYI you can export your gear lists from LighterPack as CSVs and then import them to MileStepper. It'll ask you to map the respective fields, and you'll need to tweak items after import to get them perfect, but it gets you partway there. Also, looks like they have a global database (but you can override products' details in your own "closet").