After doing some research, although in retrospect, I may have wanted to do the research earlier. GSI has always had some of the more reliable gear and this product is no different. The cup itself is made out of polypropelene which doesn't leach in either direction and is bpa free and safe! After having used it several time, going back and forth from boiling hot coffee to iced cold water, I can tell you that the coffee taste does not leach into the cup!

Is there a replacement oring or seal for this?

Just buy a new one if you’ve wore it out.

How can I wash the outside sleeve?

You could hand wash with mild soap or put through washer with cold water but I would not recommend putting it in the dryer. Towel or air dry for best results and minimum wear/tear.

If by stackable you’re asking if they’ll nest together, then no, they won’t.

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Description

🥾 Sip smart, roam free — the ultimate mug for the modern trailblazer

SMART DESIGN DETAILS - Sealable sip-it top and insulated sleeve with handle for on-the-go convenience
EFFORTLESS PORTABILITY - Ultra-lightweight at just 3.84 oz—carry less, explore more
VERSATILE USE ANYWHERE - Freezer safe and insulated to keep your drinks just right
ECO CONSCIOUS HYDRATION - BPA-free and reusable for guilt-free sipping
ADVENTURE READY DURABILITY - Break resistant design keeps up with your wildest hikes

The GSI Outdoors Infinity Backpacker Mug is a 17 oz lightweight, insulated camping mug designed for durability and convenience. Featuring a break-resistant, BPA-free build with a sealable sip-it top and insulated sleeve, it’s freezer safe and perfect for travel, backpacking, and outdoor adventures. Compact and eco-friendly, it’s crafted to keep your beverages at the ideal temperature while fitting seamlessly into your active lifestyle.

Specifications

Brand	GSI Outdoors
Color	Blue
Special Feature	Break Resistant, Foldable, Freezer Safe, Light Up, Lightweight, Non-Slip
Style	Modern
Theme	Ecological,Travel
Included Components	17 fl. oz. Mug, Sealable Sip-It Top, Insulated Sleeve w/ Handle
Shape	Round
Pattern	Solid
Product Care Instructions	Hand Wash Only
Age Range (Description)	Adult
Material Feature	Insulated
Reusability	Reusable
Unit Count	1.0 Count
Item Weight	3.84 ounces
Product Dimensions	3.6"W x 4.6"H
Material Type Free	BPA Free
Number of Items	3
Customer Package Type	[POSSIBLE] FFP
Finish Type	Matte and Textured
Manufacturer	GSI Outdoors, Inc.
UPC	090497752520
Global Trade Identification Number	00090497752520
Size	1 Count (Pack of 1)
Item Package Dimensions L x W x H	5.24 x 4.72 x 3.78 inches
Package Weight	0.11 Kilograms
Item Dimensions LxWxH	4 x 3.6 x 4.6 inches
Brand Name	GSI Outdoors
Warranty Description	All GSI Outdoors products are fully warrantied to the original owner against manufacturer's defects in materials and workmanship.
Model Name	Infinity Backpacker Mug
Suggested Users	unisex-adult
Part Number	75252
Model Year	2018
Sport Type	Camping & Hiking

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