We’ve all succumbed to the last-minute buyer’s instinct. How many of us have snatched a soda or a candy bar from the register right before we pay? Sometimes those impulse buys are great (like new boots right before a surprise winter storm), but a lot of times we regret the things we buy. Here are five things that people almost always immediately regret buying.

Bottled water

Okay, so when you’ve been flying in an airplane all day and just need something to drink, bottled water might be an easy alternative to dying of thirst. But most of the time, it’s easier (and more environmentally friendly) to carry around a water bottle and just refill it as needed. It’s a lot cheaper, too!

Infomercial products

Yes, TV infomercials are still a thing, and yes, people are still buying their products. Don’t be one of those people! Chances are, you don’t actually need any of the items the sellers are trying to market to you (most of us don’t need to be able to glue a boat back together), and you’ll probably only use them once, if at all, before throwing them out.

Gym memberships

Going to the gym should be a good thing, right? But let’s be honest: how many of us have a gym membership that’s sitting unused in our wallets? Unless you’re really sure that you’re actually going to go to the gym, don’t buy a membership; it’ll just be one more thing to pay for.

Boats (yeah, for real)

During the summer, everyone loves going out on a boat to enjoy the lake. But what happens during the winter? Expensive mooring costs, plus the expenses of simply maintaining a boat that you’ll likely only use a few times per year, can eventually outweigh the value of your new watercraft. So, really think about how much use you’ll get out of it before you drop that money on a boat.

Cheap mattresses

Unless you travel most of the year, you’re going to be using your mattress fairly often. So don’t just go for the cheapest one! You want something that will keep your back supported and you comfortable all through the night for years to come. Do lots of research and shop around before making a final decision. That way you won’t buy anything you regret!