https://imgur.com/a/lsdWJym

Katadyn Befree: 2.3oz, never used in the field, only tested at home with tap water. $25 shipped

HydraPak Seeker: 3.3oz, holds 3 liters, used this past season, excellent condition. comes with stuff sack. $15 shipped

Keith ti bottle: 3.4oz, holds 550ml/18 oz fluids, never used, comes with neoprene cozy. great for winter! $30 shipped