I've replaced the stock band on my Cressi Archimede with 1" wide elastic (purchased at WallyWorld). Just remove the watch style pins, take them out of the band, replace them into the computer case, and thread the elastic under the pins. I did two bands, one inside the other, for redundancy. I overlap the join and superglue twice (once on each end flap), then add a bar-tack between the glued ends. I did something similar with my previous computer (a Cochran AquaNox [not too many of those around]) and the elastic bands lasted about four years before they stretched out and needed to be replaced.