The Coleman Kompact Sleeping Bag Collection differs by shape and by temperature rating. Check out our review of each one.
This collection includes three different types of sleeping bags, one is a mummy-type, one is rectangular but with a contoured piece for the head, and one is a pure rectangular bag but with three different temperature ratings. So as of the moment of writing this text, you have 5 options in total.
They are a part of what Coleman describes as Kompact Collection, so this should mean that their packed size is smaller when compared to some other bags of this brand. But if you check some of their sleeping bags from my separate list, you will realize that there are more compact bags there than in the list here.
In any case, here are the bags listed by their length from longer to shorter.
Coleman Kompact 40°F Big & Tall Contour Sleeping Bag

The word Contour in the name of this pad describes the contoured extension for your head. So this is not a hood. The words Big & Tall here describe what they say about the height of potential users, they claim the bag is suitable for people of up to 6 ft 5 in (196 cm).
The bag is rectangular so you have plenty of space to sprawl inside, the dimensions are 84 x 39 inches (213 x 99 cm). This makes it very suitable for users that feel constrained in a mummy type bag. Now, is it really compact with its packed size of (L x D) 18.1 x 9.4 inches (46 x 24 cm)? You can compare it with the other sleeping bags in this collection.
The official temperature rating here is 40 F (4 C). For this you have their Coletherm Max premium lightweight synthetic fill, and they have added their usual Thermolock draft tube that prevents heat from escaping through the zipper. The zipper itself is with their patented ZipPlow design for a snag-free opening and closing. The fabric is polyester. I think I would not use if for more than 2 seasons in the warmer part of the year.
In the picture you can see some loops and toggles on the sides, so this is their Roll Control patented design that keeps your bag straight while rolling it up. Note that the bag is machine washable for easy cleaning, and it comes with a 5-year limited warranty. It has also their Comfort Cuff design with a soft material around your face as you fall asleep, and the Quick Cord tying system.
Please see more in this short video:
Coleman Kompact 25°F Mummy Sleeping Bag

As the name tells you, this is a narrow bag and this is what makes it more thermally efficient. It is hooded, and its inner volume is smaller than in any rectangular sleeping bag and this is why it is warmer. But this also means less space inside, so as usual this is a sort of trade-off.
The official rating is 25 F (-4 C), and this would make it a 3-season bag. The insulation is again their synthetic Coletherm Max premium, and the fabric is a polyester. So the bag is easy to maintain and it is machine washable. The same Thermolock draft tube is here, as well as the snag-free ZipPlow zipper design.
The packed size is (L x D) 15.4 x 9.4 inches (39 x 24 cm), and it is for users of up to 6 ft 2 in (188 cm). The dimensions of the bag are 82 x 32 inches (208 x 81 cm). The weight is 3.5 lb (1.59 kg). It also has a 5-year limited warranty.
More you can see in this video:
Coleman Kompact Rectangle Sleeping Bag

This bag is pure rectangular, there is neither a hood nor a head pad. They build it with three different temperature ratings that include 20, 30, and 40 F (-7, -1, and 4 C). So at least one of them could be formally described as a 3-season sleeping bag, but bear in mind its shape and the absence of a hood. It is best to try it in controlled conditions to see how well it can protect you.
The main features of this sleeping bag are the same as in the Contour model above, only the shape in the head area is different. There are differences among the three of these bags because of the temperature rating differences, so this affects the weight and the packed size.
The packed 20 F bag measures (L x D) 15.7 x 9.8 inches (40 x 25 cm). Its overall dimensions are 75 x 33 inches (191 x 84 cm), and they write it is for users of up to 5 ft 11 in (180 cm). So most likely it is not the best choice for most male users. It is machine washable for easy cleaning, and with a 5-year limited warranty.
Please have a look here about these sleeping bags:
Final thoughts
So this Coleman Kompact Sleeping Bag Collection includes quite a number of bags in the temperature rating range of 20-40 F. I would say that their best features are the price and the ease of maintenance. All are machine washable.
On the other hand, they come with the set of features (mentioned in the text above) that are now standardly used in the bags of this brand, and some are even patented. So with such features, this is a great collection for family use. You will not spend much and you will still have sleeping bags from one of the best known outdoor brands. The shortest version in the list is quite suitable for kids and teenagers.
I would not rely on the official temperature rating before practical tests in controlled conditions, or simply use them for warm weather camping and for the warmer part of the year in general.
Thank you for reading. Let me know if you have questions, there is a comment box below.