DO NOT DO THE FOLLOWING:
Hang the metal lock from the turn lock or have it swinging loose from the tirrette it can cut the leather into arch pattern (leather or exotic skin covered locks are usually ok)
Spray perfume into or on to your bag.... this is very difficult to remove Also be careful of spraying perfume on to yourself with your bag near by...
Let your pets use them as toys or bathrooms
Use baby wipes to clean them it can remove the finish of your bag!
Let mean and or jealous people near your bag with a sharpie penif you like them and they like you then its ok
Keep them in a lighted display case or window unless you want color fade and zoning
Let some company treat your bag with a spray on plastic coating to try and keep it looking new forever eek the leather will dry out below and it will look like heck guaranteed in a couple of years down the road
Use products made for human skin on your bags like sun block or tanning lotion, face or hand cream
OCD care cleaning or conditioning too often can remove the bag's finish and can overly soften it leading to losing its shape and stretching out. Yes cleaning or conditioning with a product every day is way too much, a simple wipe down with soft dry clean cloth will suffice most days after use unless you had a spill or greasy or sticky stuff on the handles then clean it of course
Placing your bag on top of your car while multi tasking and driving off with your bag on top of your car ... yes this has happened!
Leaving the plastic on the hardware ... this can lead to pitting when moisture sneaks up undeneath
Bring your bag to the hair salon where it can get spilled on with hair dye! do yourself a favor and bring a plastic bag to cover it or leave it at home!
refuse to do basic up keep or send it to the pros for general spa services at least every few years
Send your bag to have it sprayed with leather paint to change the color because you are bored with the orginal
Make art on your bag if you don't like your own Art ! Avoid Sharpie pens....in such a case...
And i'm sure there are more.... feel free to add some other don't do this to your bag cautions in the comments section below :)