This is what I've put together for my daughter who has Type 1, so some of this will obviously have to be modified for a person of the male persuasion who may not be comfortable carrying a "man purse." (BTW, I really admire men who carry bags [whether or not they use them for diabetes supplies] and don't care about what other people may think.) Caveat: Although it's easy to leave a diabetes bag in the car or out in the hot sun, try to avoid doing so and/or use a Frio pouch! My daughter has a zippered case that her PDM came in; we ordered a more colorful one from Sugar Medical which, other than the snazzy print, is virtually identical to the original bag that was included with her PDM. In that zippered case are the following: PDM, lancing device, container of test strips, two spare batteries, spare Pod, 2 alcohol wipes, 2 Uni-solve wipes, 2 I.V. Prep wipes, a few strips of Opsite Flexifix to help secure her Pod if she decides to go swimming, and a syringe in the event that her site fails and her BG goes high quickly and we need to inject insulin before applying a new Pod. This case goes into a cool, relatively small purse we got from Overland Equipment that I love because it has different compartments (one zippered) and pockets to hold other stuff. Her PDM case goes into the middle, zippered compartment, along with a ziplock containing Skittles (my daughter's low treatment of choice these days; easy to dose because one Skittle equals one carb) and a small juice box. The compartment covered by the velcro flap contains her mobile phone. The back open compartment is where her Frio wallet containing a pen vial of insulin goes. In addition, she wears her Dexcom receiver in a Spi belt around her waist. In another pocket of her Spi-belt is another ziplock containing Skittles to treat a low in the event that she's left her purse at home and is outside wreaking havoc in the neighborhood.
I know, this sounds like an awful lot of stuff, but you'd be surprised at how much you can fit into a relatively small carrier (once you find the right one)!
P.S. We were instructed never to use refrigerator-cold insulin in a Pod. That's why we use a Frio pouch; it keeps the insulin cool but not too cold. We keep the Frio pouch in the back, open pocket of the purse because Frio pouches need to "breathe" in order to keep the insulin cooled.