I needed a large (check-in-size) bag/suitcase/pack for an upcoming 6-week trip. Being a fan of backpacks and Peak Design, I was excited to try out their new 65 liter pack. For the past few years, I've been relying on Eagle Creek's now discontinued Load Hauler, which, when un-expanded, was passable as carry-on size, but still packed a nice ~50L of stuff. So going into this, I was most concerned with how much more I could do with this 65L pack.
To start, I've included several photos of the Peak Design pack next to my Eagle Creek pack, with both packs fully expanded. It is clear right away that the Peak Design pack is a substantial size (again, that Eagle Creek bag pushes the limits of carry-on luggage size). The fabric is sturdy and stiff and has a rubberized feel to it. The Peak Design bag looks nice, and not at all like a camping/hiking pack. The inside is well put together with several interior pockets and nice fabric. The backpack straps are nice and padded, and the hip strap is a definite must-have on a large bag that might carry a heavy load. Overall the bag is definitely more comfortable to wear on my back than my eagle creek bag, but not as comfortable as large packs by Osprey or other companies that have proper suspension frames.
However, after spending hours playing with and test-packing my various bags, I think there are some issues that make the Peak Design bag less than ideal for airline travel, and I ended up sending it back.
First, although it appears noticeably larger than my Eagle Creek bag, it was difficult to fit that much more into it vs the 57L expanded form of my EC bag. Second, I found the bag to be somewhat awkward to use. The fabric is very stiff, and the zippers tuck away into little folds in the fabric, which makes it difficult to access and use. It might loosen up over time, but it seemed like I was constantly fighting with the bag to open/close it. Third, and most importantly, while most travel packs have straps that can completely hide away, the Peak Design bag's straps hide behind magnetic "flaps" on the top of the bag (see my last photo, where both bags have their straps stored). There are two issues with this if you plan to check this bag with an airline (which is a must if you fly with it). First, while there are handles on the sides and ends of the bag, these flaps look very much like handles and I think most baggage handlers will try to grab it by the flap, which will cause the straps to come out from underneath (and/or the bag will fall if they try to hold it by the flap). Second, the straps do not completely fit behind these flaps. The bottom portion of the straps are always poking out (see photo). If you've ever checked packs before, you know that loose straps are very routinely ripped off by conveyor belts, so you really do want everything tucked away nicely. Some other brands actually include heavy rain covers that double as luggage protectors and keep the bags totally enclosed when you check them. That would be a necessity here -- I would not want to check this bag as I imagine it would quickly get damaged.
So, while I overall like the bag, and if it were a carry-on-only type bag, I would probably keep it. However, I think this design is not great for someone who wants it to stand up to the rigors of airline checked luggage. I do highly recommend their products in general, but this one is a no-go for me.