Working in a multi-team, multi-program, multi-product environment brings several challenges. One of those is providing a smooth flow of work to teams, and incorporating their feedback, while staying responsive to the needs of the business in a changing environment. Managing the portfolio backlog is a critical piece of the solution. This Experience Report documents several years’ experience working in such environments. The focus of this Experience Report is specifically on managing the portfolio backlog, not the full scope of what could be considered under a portfolio management strategy and implementation. We have found that getting the portfolio backlog management strategy right is a key element in the success of the overall portfolio management approach.