A simple fast alternative is to present the portfolio digitally on a tablet such as an iPad. It avoids plastic sleeves entirely, looks clean and professional, is easy to carry, and lets you quickly curate exactly which images to show for a specific meeting. You can also include more work than you could reasonably carry as prints, while still controlling the order and pacing of the presentation. If your main goal is a polished temporary solution available on short notice, a tablet is one of the most practical options.