I've owned this a couple years, and have found it increasingly useful.  I bought it because the canvas looked rugged and the straps are padded, and hoped the metal zippers would hold up better the plastic zippers on the usual ripstop nylon backpacks I've had.
I was initially dismayed at the smallish size and the upper flap that doesn't really cover the top, unless the drawstring has it at least partially closed.  But the size is convenient as a day pack for work, seminars, short hikes and foraging excursions.  I also have come to rely on this for my means of packing a half dozen 1.5 liter bottles of water up a hill to water trees I've planted in a remote area.  It handles the weight and bulk of that just fine for the past 2 years now.
The shoulder straps remain in place during the climb or walk to work or around town, are easy to adjust, and the free ends make it easy to doff.  The smaller pockets inside and out make it easy to pack a map, flashlight, hand warmers, small pruners and knives, snacks, and various writing supplies and recording device. Inside the backpack I can fit stationary, including ring binders or folders, my tablet or a small notebook computer (maybe a 14 inch), and light change of clothes.
The primary problems I find with this pack are: there are no outer pockets big enough for a water bottle.  The zippers seem durable enough, but they can be tough to zip at times, if the fabric is not taut.  There are no rubber soles or feet to keep the pack steady on the ground and protect it from wet and soiling.  The snaps which secure the leather straps can be annoying when they pop off under strain, but it would be more annoying if it was the leather strap tearing; it is just a reminder to back off the tension.
I like this pack, and I plan to purchase another, so I can have one for upscale use and the other for outdoor tasks.