Tiny rubber stopper thing on kids HydroFlask straw top. Not sure

Multi-Compatibility: Straw Lid Fits for Hydroflask Wide Mouth Water Bottles 12 oz, 16 oz, 18 oz, 20 oz, 32 oz, 40 oz,, with a 2.28 Mouth Diameter.

Straw Lid for Hydroflask Wide Mouth Water Bottle - Fits 12/16/18/20/32/40 oz Bottle - Comes with Replaceable Nozzles, Straws, and Cleaning Accessories

Hydro Flask 12 OZ Kids Wide Mouth Straw LID and Boot Honeydew : Sports & Outdoors

Insulated stainless steel water bottle for kids.

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Ouharty Replacement Straw Lid for Hydroflask Wide Mouth Water Bottle, Top Lids with Straw for Hydro Flask Accessories, Replacement Straw Cap for Hydroflask 32 40 64 oz Wide Mouth Bottle

For ages 3 plus TempShield️ double-wall vacuum insulation keeps contents cold up to 24 hours Made with 18/8 pro-grade stainless steel for durability,

Hydro Flask Kids Wide Mouth Straw Cap And Boot

Iron Flask 40oz Stainless Steel Wide Mouth Hydration Bottle With Flex Straw Lid Dark Pine : Target

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Straw Lid for Hydroflask 24 oz, 21 oz, 18 oz — Paracord Handle, Shoulder Strap, Straws, Straw Cleaner — Standard Mouth Water Bottle Accessories Kit for Hydro Flask, IronFlask and More (

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Straw Cover Cap for Hydro Flask All Around Travel Tumbler with Handle, Reusable Silicone Straw Stopper Tips Compatible with Hydroflask 30&40 Oz Tumbler with Handle (Flowers, 12 Pack) : Sports