If you are considering a bowl, you might want to try one of these:
Backpackers Pantry Lightweight Pack Bowl
I carry one in my filter kit. It's 1.2 oz and wraps around my Hiker filter so weight/space is fairly negligible.
It's handy when you can't find a comfortable place to pump directly at the water source. Fill up the bowl, find a nice place to sit, and pump there. And if the intake tube to your filter happens to detach, it won't get washed down Yosemite Falls.
