Stainless bottle, 1.5L with insulated pouch that zips off with attachable & adjustable strap for easier transport. Very quick push button to open for drinking on the go and then the latch and be locked down to avoid and accidental opening. Despite both the bottle and insulated case being black it stays cool for a long time even in full sun on the seat in the car (refrigerated bottle even longer). Easy cleaning by hand. I bought 2 as I'm a big water drinker. 4months of every hour/7days usage and still like new dispite some hard action at work.