I have a Bionx battery for my electric I want to conceal in a backpack on a certain section of my route and am looking for recommendations.

This is the battery I have:



But when I store it in my merrill backpack it looks massive, like I'm going camping for a week, and the weight pulls my pack to one side uncomfortably.

Anyone know of a good way (or type of pack) I can conceal the battery (in) comfortably and inconspicuously while riding and not in use?

For various reasons I don't want to advertise I'm on an electric bike. thanks.