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.
Hydro Flask Staff
Feb 04, 2026
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.
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, designed for bottles, are threaded and screw securely. Lids, designed for drinkware like tumblers, mugs and other cups, feature a snug press-in fit.
| 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 |
| Size | Boot | Cap & Lid |
|---|---|---|
| 21oz | Small Boots | All Standard Mouth Caps |
| 24oz | Small Boots | All Standard Mouth Caps |
| 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 |
| 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 |
| 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 |
| Size | Boot | Cap & Lid |
|---|---|---|
| 24oz | Extra Small Boots | All Medium Lids |
| 32oz | Small Boots | All Large Lids |
| 40oz | Small Boots | All Large Lids |
| Size | Boot | Cap & Lid |
|---|---|---|
| 16oz | N/A | All Medium Lids |
| 20oz | Extra Small Boots | All Medium Lids |
| 28oz | Small Boots | All Large Lids |
| Size | Boot | Cap & Lid |
|---|---|---|
| 6oz | N/A | All Small Lids |
| 12oz | N/A | All Medium Lids |
| 24oz | N/A | All Large Lids |
| Size | Boot | Cap & Lid |
|---|---|---|
| 16oz | N/A | All Small Lids |
| 20oz | N/A | All Small Lids |
| Size | Boot | Cap & Lid |
|---|---|---|
| 12oz | N/A | All Small Lids |
| Size | Boot | Cap & Lid |
|---|---|---|
| 10oz | N/A | All Small Lids |
| Size | Boot | Cap & Lid |
|---|---|---|
| 12oz | N/A | All Wide Mouth caps |
| 18oz | N/A | All Wide Mouth caps |
| Size | Boot | Cap & Lid |
|---|---|---|
| 24oz | Extra Small Boots | All Medium Lids |
| Size | Boot | Cap & Lid |
|---|---|---|
| 12oz | N/A | All Small Lids |
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