Big Agnes Crystal Sleeping Bag: 30 Degree PrimaLoft/Down

I like the room that this bag has in it. When I use my un-insulated air core mat though a lot of heat is lost and I find my self getting cold easily even in the low 40s. When I use a regular foam mat I have no problems at all staying warm. It also will zip together with a Marmot bag. I would definitely buy this bag again. Packs down to a decent size. It's a little heavier than my 15 deg down bag but The synthetic is nice to have since I will mostly be using it in wetter areas.

Nice Bag for cool weather.... must use Primaloft insulated pad to keep the warmth....very roomy for a mummy type bag can roll around inside.... zipper could use a little more attention tends to snag somewhat...overall good bag for daycamping, car camping & inside the tent ...hope this helps

I used the bag on a night that got down to 30 degrees and I was warm all night sleeping in my boxers so I am sure in long johns the bag is good to 20 Degrees. The sleep pad being integrated into the bag is brilliant. I slept on a slight slant and never fell off my pad. It is ridiculous how comfortable the whole system is together. The best part is I can now fit my bag, pad and pillow (Therm-A-Rest small compressible) all into the included stuff sack and it all fits neatly in the sleeping bag pocket on my pack. I Highly recommend Big Agnes insulated sleeping pads and their sleeping bags to anyone who wants the most comfortable sleep available while being lighter and taking up less space than anything else out there!

This is an incredible bag for the price. The mix of down and primaloft keeps you warm, dries out quickly, and gives you that comfort of down loft that other synthetic bags lack. The outer shell is very durable and stands up to a ton of abuse. You'll definitely need to get a pad for this one. Big agnes doesn't insulate the bottom of their bags because they have a sleeve for a pad to go there. They do this because insulation on the bottom of a bag is severely reduced when you lay on top of it and really isn't necessary. You also can't roll off your sleeping pad which is the biggest pro in my book. I would recommend the Big agnes insulated REM pad. This adds insulation the bottom of the bag and insures that the cold ground won't get to you.