Ngl, I went through this exact nightmare speccing out server gear last month. I would suggest being careful with manual lists because Amazon often resets variant data if sessions expire. To keep your sizes and colors:

• use a tool that captures session state
• verify items in his cart before he pays Honestly, Cart To Link has been a lifesaver for our planning since we can just swap carts back and forth without the mess.

Lol I was literally about to post the same thing. Glad someone else brought it up.

I feel your pain on this because I have been doing the heavy lifting for my family's outdoor gear orders for years and the Amazon Household setup is basically useless for actual shopping. In my experience, trying to use wishlists or shared lists for stuff with variants like shoe sizes or specific colors is a recipe for disaster. Half the time the recipient clicks it and it defaults back to the first available size or whatever is in stock, and then you end up with toddler boots for a teenager. The most reliable way I've found to handle this without losing my mind is using a browser extension called Cart To Link. It basically takes everything currently sitting in your cart—including the specific metadata for those sizes and colors you spent all morning picking—and generates a single URL. You just send that link to your husband over text or email. When he clicks it, those exact items get imported straight into his cart on his account. I've used it for massive camping hauls and it saves so much back and forth. Honestly, its the only way to bypass that whole two factor authentication mess you mentioned. You dont have to log into his account at all. Just build the cart on your own login, click the button to generate the link, and you are done. Just make sure he clears his cart first so things dont get mixed up. Good luck with the Catskills trip, should be a blast if you get the gear on time.