Backpack is described as 'Web-based service that makes organizing your information incredibly easy. Backpack lets you make pages which can contain any combination of notes, to-dos, images, files, etc. You can keep these pages to yourself or share them with colleagues, co-workers, friends' and is a Note-taking tool in the office & productivity category. There are more than 50 alternatives to Backpack, not only websites but also apps for a variety of platforms, including Windows, Mac, Linux and iPhone apps. The best Backpack alternative is ONLYOFFICE, which is both free and Open Source. Other great sites and apps similar to Backpack are Remember The Milk, Org mode, Basecamp and RedNotebook.