Ultra light nylon backpacks are quite a popular category, products usually only weigh a few grams cycling to be clearly visible. It's packed very tightly (like a parachute) in a 4x6 bag. When you unzip and pull out the backpack, the holdall is an inner small pocket at the top of the backpack. There is obviously a large main room. You'll get a 4x6 mini pocket, two-way interior zipper, plus a small exterior pocket on the front of the back. You also get two mesh pockets on the sides for keys or small bottles. Probably too narrow to fold the item back tightly into a holdall. 5 stars though because I had a different nylon back for several years and never had to or tried to pack it in the tiny suitcase again. BONUS This gives me three ultra-light travel items: a couple ounces of nylon backpack, a couple ounces of inflatable pillow, and a "portable lightweight picnic blanket," which is actually a 5x5 foot plastic tarp, a couple ounces. I know I have a full area with a tarp, pillow and backpack to bike to nearby parks for a Kindle or book, not to mention the weight.
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