Since you go to the gym often (or you have the best intentions of doing so), you need a thoughtfully and efficiently packed Dopp kit — one that caters to cleaning and freshening up. With these products, you can transition from morning or midday workout without having to tote your entire shower caddy, or without needing to compromise on a well-coiffed style.
So, start with a durable Dopp kit, since you’re going to get lots of miles out of it. Then stock it with the following products, most of which are also travel-friendly. You can swap out one or two based on your own grooming needs, but this list should round the bases by cleaning and hydrating everything, and it should keep the entire load light enough for daily toting (or every other day, if you aren’t exactly true to your best intentions).
The North Face Base Camp Travel Canister

Tote It: Even though you’re not hiking the Rockies or setting up a basecamp, this durable Dopp is a great holster for your gym essentials, seeing as you’re going to be toting it to and from the gym frequently. It has a hook inside so that you can hang it in your locker or even the shower, and it comes with a lifetime warranty so that you never have to purchase another kit. It’s also the Dopp that can transition between different types of events, whereas you’ll otherwise need more than one to cover the gym, vacations, outdoor activities, and the likes.
Assuming you pick and choose your essentials from this list and pack efficiently, everything should fit into the 3.5-L volume. (Otherwise you can opt for the larger 5.75-L option.) It also comes with a mirror that you can velcro to the canister, should you be away from the bathroom vanity.