Another very important point, in my opinion, is the straps. On a backpack, straps can be numerous: they are used for vertical adjustment of the shoulder straps, but also at the sternum, the waistbelt, the various carrying handles, for compression of the bag, etc... On this bag, they also serve as structure. A good strap needs to be strong, of course, but also very flexible. In other words, polyester or polyamide rather than polypropylene (not easy to tell the difference, you might say! But that's the subject of a future article). I also look to see if the manufacturer has used bias straps (which is the case here). Bias is a type of webbing used to join two pieces of fabric together. Typically here, between the outer X-PACTM fabric and the inner X-PACTM, or between the outer polyester of the shoulder straps and the inner mesh. The advantage of a bias is twofold: it joins the fabrics together, as mentioned above, but it also reinforces the ends of the bag and protects areas that are highly exposed to wear and tear.