The 10L Sea to Summit Folding Bucket is a game changer!
We use the MSR Sweet Water filter on our backpacking trips, which usually means the two of us standing out in Lake Superior with numb legs for however long it takes us to fill up our Nalgene bottles. I'm not sure why it took us so long to buy this, but it's a game changer, and we love it!
It's small (palm size), light (2.8oz), and carries all the water we need to fill up. It's also great for those eco friendly showers on shore. I'm not sure how we survived without it.