Are you taking this instead of a sleeping bag, or in addition to a sleeping bag? I'm assuming the latter. This is almost more of an alternative to a sleeping bag for warm weather, although it weighs more than my summer bag. There's 30 deg bags that weigh less than this thing. Think about the thermolite. Yeah, it's $15 more, but it weighs a pound less and packs down the size of a cambells chunky soup can [a little smaller actually]. I just put one through it's paces in Yosemite and it was awesome, still way cheaper than a new down bag. It added a solid 10 degrees of warmth and was super comfy against the skin too. It's really going to come down to whether or not you mind the extra weight and space that this will take up. The zipper is a nice feature, but then if it's too hot, you wouldn't be using this as a liner in the first place. IF you're just using it as a sleeping bag and not a liner, go for it.