I use a two-piece Convatec, sometimes a two-piece Hollister, with no filter. If it gets gas bloated, I burp it like Tupperware. Always lubricate the edge of the ring with water or deodorant lubricant and listen for the snap as you push it closed. I also cut a small "v" in the outer flap to make it easier to open and empty, and when I fold it shut, I attach a small dollar store all-metal binder clip for extra security. At home, I rotate rinsed-out used bags and only use a new bag if I am going out for the whole day. I use a convex faceplate; Convatec has a turtle. I sometimes prefer the two-piece Hollister as it has, in my opinion, a better adhesive. The good thing about the two-piece is that you can detach it in a private bathroom and with dampened toilet paper, clean out what is stuck to the inside of the faceplate or clean it out with a shower attachment. Sometimes I use an extra skin prep to minimize staining of the faceplate tape or clean it with hydrogen peroxide. Ileostomies can be difficult with hernias and adhesions. I do use Miralax for bolus plugs that interns incorrectly call constipation. My surgeons gave me this advice, but check with your own doctor if this is a problem. I use the generic propylene glycol but use it rarely. Sometimes grape juice works to get things moving. I stopped eating a lot of grains like brown rice as they expand inside you, white rice minimally. I have no problem with Thai rice noodles, and I do use the shaved dark green tops of broccoli. Hummus is also no problem, but forget grape leaves and tabouleh, etc. I warn against using the bags more than five or six times as they tend to deteriorate where the snap ring joins the bag and can leak there. You save money with the two-piece system as the faceplate can last up to four days (for me), and I can rotate three or four rinsed bags for as much as two weeks.
One other tip is that I sometimes cut a line close to the top of the elastic on my underwear and pull my attached bag through it so the bag lies on the outside of my briefs. I presently can use a tucked-in T-shirt to cover the bag. I do this as I want to prevent UTIs by separating the bag closure from coming even indirectly near the urethra. If you use a plastic curved clip with a hook closure, you can also reinforce it with a one-centimeter O-ring available at most hardware stores that acts like a rubber band but much stronger. This prevents the clip from separating as it weakens with age. Warning: the hinge can eventually wear out and break on that end.
A lot of people do not trust two pieces, but if the ring is lubricated with a smidgen of deodorizing lubricant or even plain water, it is much easier to snap on and off, and in the case of gas, burp it. I avoid the filter bags as I often find the filters do not work and the bag seems thinner.