Versatile PVC vinyl slides for use in the field or the classroom. Pre-formed depressions ("blisters") provide a chamber for collecting and viewing organisms. The Grooved Slides feature a slide-back strip for easy access to the 32 mm dia. chambers. The Peel-Back Slides have a resealable pressure-sensitive backing over each 13 mm dia. chamber. The Aquarium Slides are ideal for collecting Hydra. Blisters have a diameter of 25mm.