After using the GSI Outdoors Microlite 720 Flip and 500 Twist bottles extensively for a couple months, I was able to assess their strong and weak points well. I will say this, there were not many weak points! Read HERE for the full review and updates.
I have long been impressed with the plethora of handy products that GSI has come out with for the outdoor enthusiast, backpacker, hiker, and general fitness minded folk. Their catalog WEBSITE ranges from cast aluminum dutch ovens (of which we own two), to backpacking stoves designed for four season use, to camp furniture and coffee brewing apparatus. They really have it all. I have now been provided two of their new vacuum insulated Microlite water bottles. Full Review