Does anyone use and recommend a particular fanny pack for carrying the M&P 9mm? I wear shorts or warm up pants much of the time with no belt. Any suggestions for concealed carry with a specific brand of fanny pack or any other suggestions?

I wouldn't recommend the fanny pack with your clothing. My recommendation is the belly band: Belly Band Holster - The Original Bellyband - Concealment Holsters. There are a number of companies that make them-take your choice.

Most fanny packs involve zippers, some use velcro and some are open on top. If you want to go that route, Kahr makes a decent, but expensive one. I think that link for the 'Belly Band' looks pretty good and hey--they even make compression underwear and T shirts, with built in holsters!

Overall, I don't think fanny pack 'system' is a real good idea and they usually hang a bit loose. I used to do some brisk walking, even some light jogging, in gym shorts with a handgun with no real safety, other than what you typically get in a M&P or Glock's trigger. I'd just tuck it into my waistband, in the small of my back. That usually worked fine, except for one time, when it came undone and ended up down in the groin of my underwear and there I was, jogging along with my loaded pistol 'down there'. Very stupid! Potentially worse than when I went horseback riding and at full gallop, the saddle totally slipped and I was under the horse! That was quite a rush
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Anyway--I find that a belt slide, leather concealment holster, worn inside my short's elastic works for me, even w/o a belt. I can jog--my shorts are usually a bit snug and if my pistol's going to go way down, I'll be aware, as I'd be inadvertently 'dropping my shorts' at the same time and risking arrest. The leather sticks to my body pretty good and I can also wear it more formally, on the outside of my belt with different sizes of pistols as well.
Ebay (fleabay?) has bunches of holsters of all types, including belt slide type and others, including some M&P specific models.

I don't know what your budget is but I have been comfortably concealing handguns IWB with either a hybrid holster like a Crossbreed Supertuck/ and Comp-Tac Minataur and quality leather holsters like Milt Sparks VMII or TT Gunleather. I used to carry a Sig P229 weighing 32oz unloaded and now a full size M&P Pro 4.25. IMHO a fanny pack screams gun and it's off the body carry so the chance of being disarmed goes up. Your holster will be a daily part of your life so you deserve something comfortable. Good luck with your hunt.

Any fanny pack will do if your m&p will fit. A lightweight snubby might work better. Just don't get a tactical looking one. A quality hiking type should be fine. Another solution could be a smart carry ( I have one but don't really like it) or a remora no clip holster. These work amazingly well if your shorts are snug enough.

I like fanny packs. Carried a full size Glock 21 for years in one while in detectives for the police department I retired from. Never had an issue. Had to qualify using it.

I used (and still do) the ones made by Blackhawk. Good, well built. Couple if sizes. You can get them online of course.

I use this one. Great quality and fully satisfied. It carries my 9mm, two mags, flashlight, knife, and my wallet and cell phone in four different compartments.

Concealed Weapon Fanny Packs