Cat flap recommendation

I'm flattening and re-building the rabbit complex and am considering putting in a cat flap between the aviary and the shed, mainly to keep the draft out in winter. I have a large lop and and mini lop. Are there any recommendations for cat flaps that are lightweight enough for a mini lop to push open? Thank you :thumb:

My rabbits are all about 2 kg and under, and manage the basic standard size cat flaps easily once shown. I think I got them off amazon for about 9£. The only problem I have is that they chew the locking mechanism off, and once went in the garage via cat flap but couldn't get out!

Ahh, I will have to keep an eye out for that. Thanks joybell. I'll have a look on Amazon. Good to know the little ones can push the door open easily.