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Product Recommendations

Hydro Flask
Accessory Fit Chart

Cleaning, bottle and drinkware accessories from Hydro Flask are designed to uplevel your bottles, tumblers and drinkware. Let’s make sure you find the right boot, cap and lid to fit your Hydro Flask. Use these handy-dandy accessory fit charts to double-check compatability.

1 min read
Hydro Flask
Accessory Fit Chart
avatar of Hydro Flask Staff

Hydro Flask Staff

Feb 04, 2026

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Sizing

Not sure if you have a Standard Mouth (SM) or Wide Mouth (WM) bottle? If the opening is slim and threading is inside, it’s a standard mouth. If the opening is wide with external threading, it’s a wide mouth.

Boots

We’ve overhauled our boot sizes to ensure a perfect fit and make it easier for you to mix and match. Boots provide a pop of personalization and added protection against bumps and dings.

Caps & Lids

Caps, designed for bottles, are threaded and screw securely. Lids, designed for drinkware like tumblers, mugs and other cups, feature a snug press-in fit.

Fit Chart

Bottles

Micro Hydro Bottles
Size Boot Cap & Lid
200 mL Micro 200 Boots N/A
300 mL Micro 300 Boots N/A
400 mL Micro 400 Boots N/A
Standard Mouth Bottles
Size Boot Cap & Lid
21oz Small Boots All Standard Mouth Caps
24oz Small Boots All Standard Mouth Caps
Wide Mouth Bottles Does not include Lightweight, Travel Bottles or Kids
Size Boot Cap & Lid
16oz Small Boots All Wide Mouth caps
20oz Small Boots All Wide Mouth caps
24oz Small Boots All Wide Mouth caps
32oz Medium Boots All Wide Mouth caps
40oz Medium Boots All Wide Mouth caps
64oz N/A All Wide Mouth caps
Travel Bottles
Size Boot Cap & Lid
24oz Extra Small Boots All Wide Mouth caps
32oz Small Boots All Wide Mouth caps
40oz Small Boots All Wide Mouth caps
Lightweight Bottles
Size Boot Cap & Lid
16oz Small Lightweight Boots All Wide Mouth caps
24oz Small Lightweight Boots All Wide Mouth caps
32oz Medium Lightweight Boots All Wide Mouth caps
40oz Medium Lightweight Boots All Wide Mouth caps

Tumblers

Travel Tumblers
Size Boot Cap & Lid
24oz Extra Small Boots All Medium Lids
32oz Small Boots All Large Lids
40oz Small Boots All Large Lids
All Around™ Tumblers
Size Boot Cap & Lid
16oz N/A All Medium Lids
20oz Extra Small Boots All Medium Lids
28oz Small Boots All Large Lids

Drinkware

Mugs
Size Boot Cap & Lid
6oz N/A All Small Lids
12oz N/A All Medium Lids
24oz N/A All Large Lids
Coffee Cups
Size Boot Cap & Lid
16oz N/A All Small Lids
20oz N/A All Small Lids
Cooler Cups Does not include Slim Cooler Cups
Size Boot Cap & Lid
12oz N/A All Small Lids
Wine Tumblers
Size Boot Cap & Lid
10oz N/A All Small Lids

Kids

Kids Bottles
Size Boot Cap & Lid
12oz N/A All Wide Mouth caps
18oz N/A All Wide Mouth caps
Kids Travel Tumblers
Size Boot Cap & Lid
24oz Extra Small Boots All Medium Lids
Kids Tumblers
Size Boot Cap & Lid
12oz N/A All Small Lids
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