I was fortunate enough to stumble across what looked to be an early prototype of the Jumbo Grabby Sack for $20 in the last Riv garage sale. It has a handle and shoulder/waist strap in the back and had a makeshift brown shoulder strap loosely attached with a sewing awl. It also has only one wood toggle with a stiffening dowel like they use on the Saddlesacks. I took off the makeshift shoulder strap and added two large eyelets in the back (like the early Backabike sacks). I've also made a stiffening framesheet with some black sheet ABS I had lying around (as I'm sure everyone does). I strapped it on with an Irish Strap for a very successful maiden voyage across the bay. I may trim down the height of the framesheet and add another shoulder strap of gray seatbelt webbing since we have commercial sewing machines in our prototyping lab. For now it seems to be working out pretty well. Photos prove it does exist: https://www.flickr.com/photos/129545862@N03/albums/72157674297473556
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