Regarding the seams, they are clean and very resistant (very sturdy nylon thread), but they are not waterproof. On the other hand, the bag being in X-Pac it is really very resistant to water so do not panic, unless you pass under a tsunami your belongings should remain relatively dry. To make sure you sleep dry, I still recommend using a liner to protect your down.
EXTERIOR
The exterior of the Mile has two side pockets and a large front pocket. In addition, you can use various paracord compression straps and a loop for an ice ax or a hiking stick. The two side pockets are in X-Pac and are well elasticated. They are perfect for holding all types of water bottles, a photo tripod or a folding chair such as Helinox Zero. The front pocket is constructed from durable lycra. I use it to store accessories I need quickly like a buff or my essential Arc'teryx hardshell. This lycra is similar to the one used at Evergoods, it is very well made and should last well over time. Unfortunately lycra is still lycra and abrasion is its worst enemy; a hole can quickly be made if you hang the pocket in tree branches for example. Under the bag there is paracord to attach a yoga mat or a tent. It's easily removable if you don't need it. As an option, you can add a small pocket per strap for immediate access to a water bottle, a snack or a smartphone (my iPhone 12 Mini fits without problem). The design is good, on the other hand, it is also in lycra so watch out for abrasion.
THE STYLE
Aesthetically, I find this Waymark Mile stunning! The design is simple and utilitarian while having a little badass side without falling into the caricature of the outdoor bag. I loved being able to choose the color of the bottom and the sides (I took the Teal color). I think it's pretty versatile, I've used it for the day when hiking, skiing and on my daily commute to the office.
THE PORTING
Carrying level, I've used it with loads of less than 10kg and the comfort is there. The shoulder straps are ergonomic, quite wide and the foam is of good quality. To properly balance the bag, the sternum strap is effective. The waist belt is built with a simple strap without padding which is more than enough for small loads.