Is it appropriate to bring your own condoms to a meet with a provider? I had a session recently where the condoms were almost too small. Is this generally ok with providers or do they perceive this is a risk (for example, I assume not everyone treats their condoms with respect; like keeping them in a wallet that can damage them)? Thoughts appreciated.

I keep one in my shirt pocket when I go to work. You never know when a hot chick at work wants to fuck after hours on the desk or a the floor. It is best to bring your own. Carry a variety latex and non-latex ones (some providers have latex allergies).  

be sure they are in a sealed package

I typically have three sizes of condoms with me. Ultra thin, regular, magnum. I prefer to use the ones I bring because I know they aren't expired and I store and handle them properly. However, for an outcall to a person I have not seen before, it can get tricky. How many of each should I bring? I would say if you are a larger than average guy wanting an outcall, it might be in your best interest to have a few magnums on hand.

Never too small or too big and I control the condom.

that way it should not be a problem... although some times I encounter with individuals that request a magnum but they actually dont need it LOL.. it's more mental i think

Because I like Magnum bareskins the best and few ladies have those, other than my ATF who bought them just for me .

but if you KNOW you require something other than just standard (or maybe have an allergy) then it's safest to bring your own and then explain. Not all providers will let you use your own - I've encountered a man that got off on the idea of getting women pregnant and was going to serious lengths to try. Just be upfront, she will either accept it or have something that works for you.  
xoxo