I am a regular visitor to Paris and though I usually don't need luggage storage, on the handful of occasions that this has been necessary, I have been using the service that is located downstairs within Gare du Nord station. I genuinely am filled with dread when I know that I will have to do this. You usually have to queue when dropping off (and collecting), you have to put all your belongings through an X-ray scanner and when you manage to get through this, you have to hunt around for a locker that is big enough which may or may not be available. In addition, it is roasting hot in there and, previously, you needed cash to hire a locker though I think now you can use a contactless card.
When I knew that I was going to have to use luggage storage last week, I was stressing in advance and bracing myself to deal with all of the above. While making my way to Gare du Nord to drop off my bags, the metro was disrupted and I ended up having to take an Uber to the station. I never usually do this but it turned out to be a stroke of luck!
By chance, my driver dropped me off in front of Bounce which is just a few steps from the entrance of Gare du Nord. You can't miss the bright blue frontage which caught my eye. I decided to investigate further and scanned the QR code displayed on the front window. In less than 10 minutes total, I had booked a locker, accessed the facility with an access code, located my locker, deposited my bag and was on my way!! The most intuitive and seamless experience which was entirely stress free. Collection - later that evening - took even less time. I will never use the storage inside Gare du Nord ever again and will be sure to pass on details of Bounce to fellow Paris travellers!