I have the bjorn one and it is AMAZING. It adjusts to fit the toilet so it is not at all shaky.
It would not fit into a diaper bag, though.
My friend has this one for her twins and she loves it and she says it travels really well. It can sit on a big potty or be a stand alone small potty, so it's very versatile. I've ordered one but it hasn't arrived yet.
We just got this one and have only used it a few times, but I like it. It's hard plastic so you can easily sanitize, folds up to a reasonable size and has handles so they can balance on potty. Just make sure that the handles are hanging over the front of the toilet seat.
Re: Rec your travel potty seat that sits ON toilet
Which ones are you looking at? I have the same question as you. This is the one that I am considering after some research.
Bjorn Toilet Trainer - https://www.amazon.com/BABYBJ%C3%96RN-Toilet-Trainer-White-Black/dp/B0009PAN7Q/ref=pd_bxgy_ba_text_c
I have the bjorn one and it is AMAZING. It adjusts to fit the toilet so it is not at all shaky.
It would not fit into a diaper bag, though.
My friend has this one for her twins and she loves it and she says it travels really well. It can sit on a big potty or be a stand alone small potty, so it's very versatile. I've ordered one but it hasn't arrived yet.
https://www.amazon.com/Kalencom-2-in-1-Potette-Plus-Green/dp/B0016KYMMU/ref=sr_1_3?s=baby-products&ie=UTF8&qid=1289906863&sr=1-3https://www.amazon.com/PRIMO-Folding-Potty-Handles-granite/dp/B000BXHPEU
We just got this one and have only used it a few times, but I like it. It's hard plastic so you can easily sanitize, folds up to a reasonable size and has handles so they can balance on potty. Just make sure that the handles are hanging over the front of the toilet seat.