Don't see the 28 mm cap adapter for a Sawyer filter, how do I order the caps for that?

Hi, the adapter is available on HydraPak.com in the accessory section.

What is the cap size please? Is the mouth like a normal bottle?

The cap is smaller than the caps for Nalgene bottles, but bigger than the caps for smart water bottles. I don't know the exact size by measurement or by its name.

Does anyone know if this product will be compatible with the MSR MiniWorks EX Backountry Water Filter? Thanks!

The HydraPak Seeker has a 42mm cap and the filter screws onto a 63mm bottle so this would not be compatible.

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Specifications

Brand	HydraPak
Material	Thermoplastic Polyurethane
Bottle Type	Collapsible Bottle
Color	Mammoth Grey
Capacity	2 Liters
Special Feature	Filter
Product Dimensions	5.12"W x 12.6"H
Product Care Instructions	Hand Wash Only
Model Name	Seeker
Recommended Uses For Product	Hiking, Camping, Backpacking
Number of Items	1
Theme	Adventure
Reusability	Reusable
Shape	Rectangular
Style	2 Liter
Finish Type	Textured
Unit Count	1.0 Count
Package Information	flexible
Specific Uses For Product	Outdoor Adventures, Backcountry, Remote Locations
Item Weight	76 Grams
Manufacturer	HydraPak
UPC	834456002468
Global Trade Identification Number	00834456002468
Item Package Dimensions L x W x H	9.57 x 6.85 x 2.52 inches
Package Weight	0.12 Kilograms
Item Dimensions LxWxH	5.1 x 1 x 12.6 inches
Brand Name	HydraPak
Warranty Description	Beyond Lifetime Warranty, Lifetime Warranty
Suggested Users	unisex-adult
Part Number	A822M
Model Year	2021
Included Components	1 Collapsible Bottle
Size	67.6 Ounces
Sport Type	Boating, Camping & Hiking, Climbing, Fishing, Outdoor Lifestyle

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