Stainless steel bottles are an effective, low-cost option. They’re non-reactive, BPA free, and lightweight compared to glass or their insulated stainless steel counterparts. You can’t put hot water in these as directed by the manufacturers (and you’ll burn your hands). But if you just need something for short amounts of time and don’t care about insulation, it’s tough to beat the value. Some folks prefer glass to avoid the metal smell or taste, but we found no issue with tastes on these bottles at all. We also tested one aluminum bottle, which is a bit lighter but otherwise similar.