Hilleberg tent bags are made for real life use: they're spacious enough to be used even when your fingers are getting a bit frosty. *Did you know*? Hilleberg recommends stuffing their tents in the bags, instead of rolling. Hilleberg tents tend to be used very frequently, and repetitive packing in the same folding/rolling pattern might cause the fabric extra stress. This size suits the following Hilleberg tent models: - Altai Basic - Atlas Inner Tent 6 - Atlas Inner Tent 8 - Kaitum 4 GT- - Keron 3 GT - Keron 4 GT - Saivo - Stalon XL Main Roof Some sources have criticized Hilleberg tent bags for their loose fit. The reality is, however, that if there's a lack of space, the tent will be "compressed" by other gear around it. If there's no pressure, there usually isn't a need for compression, either. Hilleberg doesn't use PFC's in any of their products.