Zipper Options:
Option 1) By default the sleeping bag will have a 3/4 length zipper on the bottom. The normal zipper has a pull tab on the inside and the outside. $0
Option 2) A separating zipper can be used to zip two sleeping bags together. The separating zippers we have are 56" long (roughly 3/4 length) and they only have a pull tab on the outside, so you need to reach outside the bag to unzip it. Any two bags can be zipped together, for example a long and a short. This option includes draft tubes over the zippers, since one of the zippers will be at the top center and the other at the bottom center when zipped together. $20
Option 3) Instead of a zipper, 3 evenly spaced sets of loops can be added to secure the bottom with elastic straps. This is not as convenient or as tight a closure as a zipper but it is a little lighter and the straps can be taken off entirely. 3 detachable elastic straps and clips are included and they weigh .2 oz (6 grams) compared to .6 ounces (17 grams) for a zipper. $0
Option 4) The bag can be sewn all the way up rather than have a closure system. You would get in and out through the top. If you sew up the bag you lose the versatility of opening it up when it is warm out, but it drops about .6 ounces (17 grams) of zipper weight. $0
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