Something you may have considered is whether or not the backpak will be carried or is simply carry-able. For a bag that will be carried on a long walk/hike, go to REI and try out a number of bags that are designed for hikers. It may cost a bit more, but it’s money well spent.

For a bag that is only needed to be carried a short distance, the weight and comfort aren’t as critical and maybe that heavy nylon canvas used by Max-P is a better choice.