I initially purchased one of these modular sleeping bags in woodland camo. I have an HQ brand modular sleeping bag that is over 8 years old and still going strong. In comparison to the HQ the first thing you notice is that these MT brand modular bags are larger in size ( see product photos ) so if you are budding out solo, I would suggest an A.L.I.C.E. or aluminum framed backpack to support the bag. That said a creative way of packing would be to put some of your gear and provisions inside the modular bag prior to rolling up, depending on the gear of your choice.So in comparison to size, if that is an issue then you may want to find a more compact modular bag HOWEVER!I enjoy the larger size because if you find yourself claustrophobic in mummy style bags and or are a larger person, these MT modular bags are exactly what you need. The MT bag is spacious and full of leg room.As for the temperature ratings this is what makes a modular bag the most versatile bag. There are several combinations you can choose depending on the weather, if it is below 32' F I am confident a person could sleep under the stars using all 3 bags. There is also the combination of just using either the green middleweight bag with or without the rain fly outer shell. or the black heavyweight bag with or without the rain fly and simply just using the rain fly solo in hot summer or rainforest situations. Choose any combination thereafter.As for the water resistance, compared to other nylon fabrics that are silky / shiny in appearance, the rain fly on these are a softer matte fabric but still shell water...I could go on and on about this bag, the zippers are strong and buttons snap very well.The bag is super hot and warm and retains heat very well, there is padding for the headrest and a velcro patch for full coverage over the head once inside..My only gripe is the larger size when rolled up, but the trade off is a much more down filled warmer bag with more leg room inside.I purchased 3 more after the initial one so that alone should say something, I am very rough on my gear and these are holding up nicely..