Have been using them at work for five years so bought them for home. Carrier sheets are great for small or fragile documents that can be damaged if they are fed through the scanner without a carrier sheet. If the document is flimsy, has torn corners or edges, is very valuable and damage is not an option, or the document is too small, envelopes are great! Just insert the object and run it through the scanner. Note that small items can be output digitally in full page size if scanned into an envelope, or at least in one of the programs I use. Software applications may have settings to digitally display at original size or resize after scanning - or other software applications may behave differently, but I haven't looked into that. For my purposes it didn't really matter. Only say if it matters to someone else.
PenPower WorldPenScan: Digital Highlighter, Multilingual Reading & Portable Translator – All-in-One Solution for Speech-to-Text and Scan-to-Translate
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📃 IrisCan Executive 4 Portable Mobile Duplex Document Image Scanner - USB Powered, 1-Click Scan to PDF, Full OCR in 138 Languages, Scan to PDF/Word/XLS/JPG/Cloud/, Business Cards & Receipts
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📱 Protective Hermitshell Case for Fujitsu ScanSnap iX100 Wireless Mobile Scanner
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MUNBYN Magic Wand Portable Scanner: Fast Wi-Fi Document Scanning, 1050DPI, 3sec A4 Color Scans, Includes 16G Memory Card – For Photos, Receipts & More!
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