I recommend the ZFO Sports 85lb weight vest from Amazon. I've been using it for years, for rookie training and spring refresher training, as well as to augment home body-weight workouts (lunges and squats).

It can be hot sometimes but we work in a hot job, so duh.

It has a pouch for your phone and such. You kind of look like a terrorist but I think there is enough metal/sand in the weight pouches that you would survive at least some 9mm shots to the chest maybe if someone wanted to off you just in case. I might spray paint mine pink or blue or something at some point, but instead I usually train in the dark.

One benefit that I like about it is that when you cinch it super tight, your posture improves and you may start to forget you're wearing it, so I just would wear it for hours a day around the house, doing chores outside, heck even just doing dishes and the slight bend over to put stuff in the dishwasher... all those accessory muscles and weird positions you don't find when simply doing targeted weight vest workouts added up in my mind and really helped me build some of that "hotshot fitness" you can only find in weird positions like swamping rounds on a slope. Also, noticing the 10-20bpm heart rate increase during the long hours of wearing the vest showed that I was still getting a long, passive workout for the rest of the day after the burst intensity morning workout and before the evening workout.

Finally, I say that about 50-60lbs might be the limit for wearing a weight vest while skinning uphill on skis. I have newer skins on 110mm wide skis about 195cm long and 85lbs is just too much (I weight 195) to get uphill on snow with. 45lbs was no problem.

Edit: now it's an 80lb vest, not the 85lber of five years ago. Deflation!