These dollar bill sleeves are exactly what serious currency collectors need for protecting their investments. Each sleeve measures 6.8x2.9 inches, which is the perfect size for standard US currency - bills slide in easily without being too loose, and they're completely visible through the crystal-clear hard plastic. The material is rigid enough to protect against bending, creasing, or other physical damage, but not so thick that storage becomes bulky. The waterproof quality is crucial for long-term preservation, preventing moisture damage that can ruin paper currency. We've been using these to organize everything from regular circulation bills we're saving to more valuable star notes and older currency - they keep everything in pristine condition and make viewing collections so much easier. The hard plastic doesn't yellow over time like some softer sleeves can, maintaining clarity for display purposes. What's really convenient is that you can still handle the protected bills without risking damage from skin oils or moisture. The pack of 20 is substantial enough to organize a meaningful collection without breaking the bank. For coin and currency shows, these make transporting and displaying bills much safer. They stack neatly in storage boxes or display albums, and the consistent sizing looks professional for organized collections. Whether you're a serious numismatist with valuable notes or just someone who likes to save interesting currency, these sleeves provide that essential protection that preserves condition and value over time. Simple, effective, and affordable protection for paper money collections.