Safe Use of Contactless Payments
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Contactless payment is generally quite secure, protected by built-in transaction limits and, for larger amounts, a firm requirement to enter a PIN, which together genuinely limit how much could ever be spent even if a card were unfortunately lost or stolen entirely that same day.
Keeping cards in a wallet that shields against unintended scanning, while a reasonable enough precaution to take, matters considerably less overall than the layered protections already built directly into the payment system itself, including transaction limits and active fraud monitoring run continuously by your own bank.
Checking statements regularly remains the genuinely most effective way to catch any unauthorised contactless transactions early, since individually small amounts can otherwise go unnoticed for a good deal longer than a single larger, more obvious charge sitting plainly on the same page would ever be.
Reporting a lost or stolen card immediately, rather than waiting around to see if it eventually turns up somewhere, allows your bank to properly block contactless and other transactions before any further, ongoing activity can occur on the account while the card is still missing.