Interesting idea. I have the 3 liter Big Zip hydration bag. It and the 4 liter version have gromets at the corners wher you can tie paracord to create a handle. But it's a little big for a mini PSK, but a good size for small or mini BOB. Or an item to include in your BOB and hold you items that need protection from water.
BTW, the 1 liter is the smallest Big Zip. It's :
Big Zip 1: $20.95*
Weight: 3.5oz/100g
Volume: 35oz/1.0liters
Size: 6x12in/15x30cm\
Big Zip 3: $24.95*
Weight: 4.5oz/135g
Volume: 100oz/3.0liters
Size: 7.5x17in/19x43cm
Big Zip 4: $26.95*
Weight: 6oz/170g
Volume: 130oz/4liters
Size: 9x17in/23x43cm
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Willie Vannerson
McHenry, IL