I feel lucky that since I have had my (1 month old) ostomy, the products that I have first tried seem to be working GREAT. I have been changing my system every 5 days (just to be safe--I am so paranoid about leaks! but none yet-), and even after 5 days it is hard to pull the wafer off...!
I am using the Coloplast Assura line, and I get the "Extended wear" wafer...I take showers at least once a day, and have been walking outside on really hot days and sweating a lot...but still it stays well. Cecilia has said she uses the same type and they have worked well for her
The Assura line I believe comes with 2 sizes of regular bags, and I use the smaller ones....there are also mini-bags available which are even smaller and contoured at the bottom to fit your body well (they get skinnier at the bottom), and they fit the same wafer. And lastly, this line also makes stoma caps which fit the same wafer for intimate times, if you are sure you are not going to have much output (they are Really small...!).
All my bags use velcro, which I like. :)
My problem is I am still having a hard time finding pants....my stoma is low, and all of my pre-surgery pants sit Right on it....so I have been buying pants that ride a bit higher, but I am still not liking wearing my pants up higher than I normally would...my surgeon said "well, now you have a good reason to go and buy a lot of new pants...!" haha, sure buddy.