Does it have an equivalent for Bundles (specifically bundles in the inbox) - the one feature that distinguishes Google Inbox ( https://inbox.google.com https://

Does it have an equivalent for Bundles (specifically bundles in the inbox) - the one feature that distinguishes Google Inbox ( https://inbox.google.com https://inbox.google.com ) from every other client as far as I know. I'd be very interested in a competitor for that feature as I couldn't do without it now and I'd like to know I have options if Google retires it or modify it beyond recognition. (Brief summary - they are like smart folders but they appear as a single item in your inbox. It enables me to bundle up various newsletters, server alerts and more broadly themed collections of mail and decide which ones should appear in my inbox immediately, daily or never. If I used traditional folders or labels then they end up forgotten or ignored. It allows you to file/categorize but still maintains the "my inbox is my todo list" paradigm.)