The Packa is available in five sizes: Small/Medium/Large and MediumX/LargeX. Unless you are a very large person, sizing for the Packa really only depends on your height and pack size. The Packa is made very large in the jacket part to aid in air circulation. The small is best for people 5'7 and below. Medium for 5'8 to 6'. Large for above 6'. Backpacks with a volume of 4600 ci or 75 liters work best with the small, medium, or large Packa. Above 4600ci or 75 liters require the "x" size.
The Small/Medium/Large Packas have the same packcover size at around 4600 ci or 75 liters. The packcover dimensions are roughly about 10 inches deep by 12 inches wide by 29 inches tall. The packcover also has 3 inch pleats on both sides at both the top and bottom increasing the volume beyond simply 10 x 12 x 29.
The MediumX and LargeX sizes have the same jacket size as the regular Medium and Large Packa, but have slightly larger packcovers– up to about 5500 ci or 90 liters. Size Small is not available with the “X” size packcover. The packcover dimensions for the “X” size Packas are about 11 inches deep by 12 inches wide by 32 inches tall. The “X” size packcovers also have the 3 inch pleats that increase volume.
The Small/Medium/Large Packas have the same packcover size at around 4600 ci or 75 liters. The packcover dimensions are roughly about 10 inches deep by 12 inches wide by 29 inches tall. The packcover also has 3 inch pleats on both sides at both the top and bottom increasing the volume beyond simply 10 x 12 x 29.
The MediumX and LargeX sizes have the same jacket size as the regular Medium and Large Packa, but have slightly larger packcovers– up to about 5500 ci or 90 liters. Size Small is not available with the “X” size packcover. The packcover dimensions for the “X” size Packas are about 11 inches deep by 12 inches wide by 32 inches tall. The “X” size packcovers also have the 3 inch pleats that increase volume.