Review on 🥤 3-Piece Set: Collapsible Stainless Steel Travel Cups with Lids - 2.5 oz, 4.7 oz, 8.2 oz | Portable Folding Camping Cup for Dishes & Utensils | Expandable Reusable Drinking Mug for Survival, Hiking, Picnic by Bob Trapp

I love these watercolor travel mugs. I bought two sets. Can't beat the price! I use the dirty water lid and partially fill up the clean water glass myself. You can see the average size in the photos next to the #4 Escoda Reserva Road Brush for size comparison. I took off a star because the cups will burst if you don't tighten them enough. I swore I tightened them up, filled the largest cup myself with clean water, and when I rinsed the brush out (only spinning at medium speed) the cup folded up on itself and water was everywhere! BOOO! So now I rotate the brush in the lid of the mug because it doesn't curl!