Here's what other sites are saying:
Use the 18.5 fl. oz. REI Stainless-Steel Vacuum food container to keep your soup or food warm until it's time for a trailside snack. Double-wall vacuum construction is made with premium 18/8 stainless steel that is BPA free; plastic used on the cap and interior stopper is also BPA free. Container keeps liquids warm up to 5 hrs. or cold up to 10 hrs. For best performance, condition the container by filling with hot or cold water for 5 - 10 min. immediately prior to use. Push-button steam release valve is integrated into the screw-in stopper to ease opening. Cap doubles as a serving cup and features added insulation to help keep food warm. Hand wash the REI Stainless-Steel Vacuum food container; do not microwave.
REI Stainless-Steel Vacuum Food Container - 12 fl. oz.
REI Classic Vacuum Bottle
REI Flip-Top Vacuum Bottle - 20 fl. oz.
REI Flip-Top Vacuum Tumbler - 15 oz
Hydro Flask 40 oz Wide Mouth Bottle
$30 - $42
Stanley Classic Vacuum Bottle
$19 - $49
Klean Kanteen 20oz Wide Insulated
Hydro Flask 32 oz Wide Mouth Bottle