It's not a quick release but a solomon wide bar weave would net you quite a bit of cord. A 36 inch length of rifle sling has 3 strands with 2 of them being about 24 feet and the middle one being about 36 feet. The width is perfect for a laptop bag strap.
Here is one of the one's I have made on 1.5 inch wide HK hooks. http://www.paracordforum.com/forum/f18/desert-themed-solomon-wide-bar-rifle-sling-388/
Here is one of the one's I have made on 1.5 inch wide HK hooks. http://www.paracordforum.com/forum/f18/desert-themed-solomon-wide-bar-rifle-sling-388/