I wouldn't be too concerned about finding a power bank that fits the B&R pocket between the telescoping handles. I have several B&R bags so I'm familiar with the pocket. I've also had to look for newer power supplies after my recent Dell XPS 13 purchase as I couldn't charge my new model with my older battery banks. In my research for a new one, I haven't noticed any appreciable difference in the sizes between the older power banks and the current ones--at least to 65W. If your requirement is 100W, I can't make the same assurances. Also I've found that you may need a newer USB-C charger cable. While older cables may still charge devices like phones and tablets from one of the newer power banks, I had to get some higher-rater USB cables that matched what was provided with my XPS 13 to ensure proper charging.