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Fit Guide - Only for Wide Mouth bottles ✔Hydro Flask (12oz., 16oz., 18oz., 32oz., 40oz., 64oz) NOT compatible with the Hydro Flask Growler products ✔Simple Modern Summit (10oz., 14oz., 18oz., 22oz., 32oz., 40oz., 64oz., 84oz., 128oz) ✔Iron Flask ( 18oz., 22oz., 32oz., 40oz., 64oz) ✔Takeya (14oz., 18oz., 24oz., 32oz., 40oz., 64oz) ✔FIFTY/FIFTY (12oz., 16oz., 18oz., 20oz., 34oz., 40oz) ✔MIRA (12oz., 18oz., 22oz., 32oz., 40oz) ✔HYDRO CELL (18oz., 24oz., 32oz., 40oz) ✔Klean Kanteen (12oz., 16oz., 20oz) ✔the flow (18oz., 32oz) ✔Thermoflask (24 oz) ✔Hydrology / Liquid Savvy / Hydrate/Smart Flask Water Bottles with 2.28 inches outer-screw mouth diameter. Note: ✖NOT fit Standard Mouth or Narrow Mouth water bottles ✖NOT fit YETI, RAMBLER, RTIC, OZARK TRAIL, Bubba, Manna,etc ✖NOT fit TAL or Hydrapeak Round Bottom ✖NOT fit beer cup, tumbler or growler Package included: 1 x Flip Lid 1 x Flex Cap 1 x Straw Lid 2 x durable rubber straws 2 x nylon straw brushes High Quality and Good Service “The Mass” stands for “Highest Quality”. We never stop improving and aim to provide you a healthy and happy lifestyle. We guarantee that you will be happy with your each purchase of our products. If for any reason you are not satisfied with your order, simply send it back for a 100% refund! No questions asked!