Big Boys in the Bathtub

I am looking forward to the day when we can just put both boys in the tub to take a bath together.  No more of Evan in the big tub and Logan in his little tub on the bathroom floor or having to do them one at a time.  I feel like we waste so much water!  Today, I decided to experiment.  I put Logan's little tub in the big tub with Evan.  It doesn't leave tons of room for Evan but it worked out ok. Based on the looks on the boys faces, I'm not sure if this is a short term solution or not though.