I have two Powell’s-branded Nal­gene bot­tles (one for math and one for physics) that have served me well over the years.  Unfor­tu­nately, they were made with the toxic BPA plas­tic, so both needed replac­ing.  The first one was replaced a cou­ple of months ago by a steel Nathan bot­tle with a flip-top sippy-straw.  I didn’t […]