Many Instagrammers use shortened link services such as Hootsuite (Ow.ly) and Bitly (Bit.ly). While shortened links are practical to use in posts and on other networks, I don’t recommend using one in your bio unless it’s consistent with everything else. Also, it helps if the link is customized or branded. For instance, an account for women’s shoes uses bit.ly/sixinchheels, which would be acceptable.
One other positive about the Ultimate Bundles affiliate program that your readers may not have realized… They actually offer second-tier commissions too, meaning you’ll earn a share of the sales from any affiliates that you refer to the program. In this case, it’s 10% of their bundle sales during their first year as an affiliate which could be a nice earner!