FLORO Transparent Window Shelf, 7x3 Inches, Crystal Clear Acrylic Ledge for Plants and Flowers, Lightweight PlexiGlass Plant Holder, 2 Suction Cups Included, for Window Gardens and Terrariums

Not sure how much weight they actually hold.I use them in fish and reptile tanks.Fish tanks after a while they do seem to "move" a bit so have to repostion them.In the reptile tanks, they seem to hold up well.Some are just a shelf to hold the thermo and held to keep the thermostat wire in place.In the Leo's tank used three to make an upper level. Ceramic tiles glued together laying on the shelf with "ramps" on each side for up and down access. Those havn't moved at all.Light weight applications seem to work fine.

i needed something to keep my google home off the kitchen counter. this little shelf it small and sticks the tile backsplash. only issue is that it tilts a tiny bit, but not enough to really matter. overall very good little shelf for a great price. i put it up 4 months ago... no issues with the suction cups.

I do not like this round one as well as the rectangle. The other one seems to hold more weight without bending. This one bends fairly easily. Not as good as the rectangle shelf.

I bought this for my 29 gallon aquarium and I’m beyond happy with this product! My fish did not like the amount of water being disrupted from the filters waterfall so I’ve been looking for something to get some calmer water flow without having to downsize my filter. After finding this and giving it a shot I can guarantee this will be my go to for any new tanks I set up. Super easy to install and it allows for me to crank my filter on full power without having to worry about my fish being thrown around the tank. I highly recommend this over a sponge to block the output or input.

Great idea but this thing can't hold much...I knew it'd be quite small but the actual shelf sags downwards away from the suction cups with any amount of weight on it.

This is a great shelf for my aquarium. I have a UV sterilizer in it. Part of it is inside the tank and part of it is suppose to stick to the outside. The suction cups on that part of the sterilizer are small and constantly fell off. This shelf is wonderful I've had it for months now, and it has not come off. I have the outside part of the sterilizer sitting on it. Problem solved...

Works as shown

I am using this to mount my Wyzecam v2 in my front window and it seems to be fine for doing that.I did take extra care to clean the inside of the window with rubbing alcohol and also used some on the suction cups to ensure the best suction power. Time will tell how well it holds to the window.