I've been using the RS Classic Travel Backpack and the Civita Day Pack since 2003 when I bought them for a trip to Italy. I have taken them on dozens of trips, foreign and domestic, and they are both holding up very well 15 years later.
The backpack is a soft-sided thing which easily crams into overhead bins. Sometimes those bins look full - and they would be for a piece of hard-sided luggage - but the soft-sided backpack form-fits into those tight spots. The backpack has several interior and exterior compartments for stashing stuff in a semi-organized way. It also has a clip fastened to the interior base if you want to clip your keys or moneybelt to it. At one point the backpack frayed along a seam where a zipper is, but a tailor fixed it good as new.
The Civita Day Pack - which I took to Civita di Bagnoregio on its first trip - is this really lightweight mini backpack with three zip pockets. It also has a clip on the interior base. I once packed sandwich meat and a candybar at the bottom of one of the pockets on a hot summer day and forgot about it. When I returned home days later my nose altered me to a truly vile union of substances in my day pack. I threw the pack in the wash and it came out perfectly clean. I've also run my bigger backpack through the wash without any ill effects. Neither the day pack nor the regular backpack are water-proof but, hey, what do you want?
I also bought the RS Toiletries Kit in 2003 and it has worked great. It has several compartments and a hook so you can hang it on a sconce or some such. Very handy in shoebox-sized bathrooms. Throw it in the wash with your jeans. Please, I insist. It also has a small plastic-like glass mirror which the airport goons never hassle me about for some reason.
Oh, what else? I've also used a couple different RS moneybelts with success but they are much newer than the luggage. The more recent ones are a tad larger and with an extra slot. Thank the old gods and the new that they can also be tossed into the wash with no ill effects.
What stuff have I bought from the RS store which hasn't worked out? I bought the Travel Alarm Clock in 2003 (before the age of smart phones). It worked fine for a few years unti it didn't. It's obsolete today, of course. In 2005 I bought a Swiss rail pass but it doesn't work at all any more. Gee, thanks, Rick.