Almost Perfect

The Boulder 10 flask met all the criteria I was looking for in a durable, portable, and transparent flask. The only thing I would improve is the cap. I was looking for a flask with a cap that I couldn't lose, which the Boulder has, but I have had other flasks with attached caps that were easier to close.

Great Product, With Only One Issue

As advertised and would definitely recommend to anyone needing a rugged, reliable way to transport spirits. The only reason for 4-out-of-5 stars is the cap. Once closed, it seals well and I'm never worried it will accidently open. Once open however, it is a little difficult to line up the threads of the cap with the flask one-handed. It's not impossible, but I find myself worrying about cross-threading and not completely sealing the flask if I can't use both hands to replace the cap.

Tacticool

Excellent flask. I like that I can see through the sides which shows how much liquid is inside. Very durable and good grip on the sides.

Handy Lightweight Flask

I like the lightweight flask as it's easy to fit in any nook and cranky in my pack and paniers. It's easy to fill and see the level since it's clear plastic. The top is a lit5le hard to flip open, so I have to lift it up to open it fully.

It has held up well. Don’t have to worry about a glass bottle breaking bouncing around the cooler. Measurement marks are nice.

High quality product for shorter trip. I prefer the 16 bit equal quality so figure out how thirsty you are first!

Take Along Beverage Container

I bought this to use for tailgating and camping in order to avoid glass bottles. Perfect size for a few drinks without having to carry excess.

It Holds Liquid

Just as it’s described, it holds liquid. I wish it refilled itself though.

Does what it is supposed to do and there's no guessing on how much was used. Keeps you from arguing with friends.

Lightweight

Great product! Lightweight, easy to carry. Clear volume markings.

Just What I Wanted

This is exactly what I was looking for. A flask without any metal. I haven’t used it so I can’t speak to durability but when washing I checked the leakproofness and it was good!

Yum

there good stuff in mine. nothing leaks. no metal used.

One Leaks

We ordered 3 of these for our kids to use while skiing. One of them leads at the lid regardless of how tight the lid is. The other two work great.

Works Great

Perfect for bringing in a little whiskey to a cold college football game since it won’t set off the metal detectors!

Great combination of light weight, durability, and function. Visible sides allow you to see what is inside, while the wide mouth on the lid make it easy to fill and use. Easily the best outdoor flask I've used to date.