I've been using the EXPLORER BOTTLE LARGE daily for hikes and my commute, and it holds up well. The vacuum insulation really does keep drinks cold for 24 hours or hot for 12, and it's 100% leak proof in my bag. The reinforced ribs make it easy to grip, and the wider base feels stable on uneven ground. The paracord loop is strong and hasn't gotten moldy. It fits my backpack side pocket at 3.5in diameter. The plastic free contact lid is a nice touch.