SCB hosted the last break I was in - so I'll use that as an example. I agree with him - almost 100%.
I don't think EACH card needs to be sleeved, but rather just the inserts/refractors/etc, and then top load all the "hits", as you mentioned. As long as all the cards are secured inside of team bags, then all those extra penny sleeves really aren't necessary, in my opinion.
Put 'em all together in a bubble mailer and you're good to go.
Originally Posted by SportCardBuffet
I sleeve all cards, top load hits & low numbered parallels or expensive rookies such as a bryce harper blue ref. Team bag them and then padded mailer or box them. If using a box I put packing peanuts in the extra space to prevent movement.