Is this comparable with a wide mouth nalgene?

I would say the only thing it is compatible with is a trash can.

Does this fit the 18 oz hydroflask bottle?

No it will fit any wide mouth bottles though- I assume the 18oz is a standard mouth bottle, they do make a flex straw lid for smaller bottles

Is the straw long enough for the 40 ounce bottle?

Yes! The straw comes extra long, and you use a ruler included on the packaging to cut it to the various water bottle sizes. Tip: cut it at a 45 degree angle instead of straight across for better performance!

Does this fit the 32 oz trail series m?

If it’s a wide mouth bottle and straw lid is wide mouth yes

Deliver to EGYPT

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Hydro FlaskFlex Straw Cap for Wide Mouth - Leakproof - Honeycomb Insulated Cap with Flex Strap for Easy Carrying - Dishwasher Safe - Black

Hydro FlaskFlex Straw Cap for Wide Mouth - Leakproof - Honeycomb Insulated Cap with Flex Strap for Easy Carrying - Dishwasher Safe - Black

Product ID: 428270286

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Details

Material
Plastic
Colour
Black
Brand
Hydro Flask
Style
Straw Cap
Product dimensions
9.9L x 8.1W

💧100% leakproof seal

🧊Honeycomb insulation tech

🧼Dishwasher safe convenience

Description

💦 Sip smart, stay leakproof, and carry with confidence!

EFFORTLESS CLEAN UP - Dishwasher safe design means less time cleaning, more time living.
STAY COOL STAY FRESH - Honeycomb insulated cap preserves your drink’s ideal temperature longer.
BUILT TO LAST A LIFETIME - Backed by Hydro Flask’s lifetime warranty—durability you can trust.
SIP SEAMLESSLY ON THE GO - Leakproof Flex Straw Lid keeps every drop inside, no spills, no stress.
PERFECT FIT FOR EVERY ADVENTURE - Compatible with all Hydro Flask wide mouth sizes from 20 oz to 64 oz for ultimate versatility.

The Hydro FlaskFlex Straw Cap is a leakproof, honeycomb insulated lid designed for wide mouth Hydro Flask bottles (20-64 oz). It features a flexible strap for easy carrying, is dishwasher safe for hassle-free cleaning, and comes with a lifetime warranty, ensuring durability and reliable performance for active professionals on the move.

Specifications

Product Dimensions	9.91 x 8.13 x 7.11 cm; 140 g
Care instructions	Hand Wash
Dishwasher safe?	Yes
Is assembly required	No
Number of pieces	1
Warranty description	Hydro flask lifetime warranty.
Batteries required	No
Included components	Water Bottle Accessory
Item weight	0.31 Pounds

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