Not every branded item earns its place in a giveaway. The ones that get kept and used long after an event, rather than binned at the door, tend to share a few practical qualities.
What makes merchandise get kept
Genuine usefulness, a pen, notebook or tote bag someone will actually reach for, beats novelty items that look interesting on a table but have no ongoing use once someone leaves the stand.
Budget tiers
Low-cost items, pens, keychains, notepads, work for high-volume handouts to general foot traffic, while a mid-tier item, a branded tumbler, power bank or tote, is better reserved for qualified leads who've had an actual conversation at the stand.
Branding visibility
A logo placed where it's actually seen during use, on the body of a bottle rather than the base, on the front of a tote rather than a side seam, gets more incidental brand exposure after the event than a technically-branded but poorly placed logo.
Matching merchandise to the audience
A B2B trade show audience generally responds better to genuinely useful desk and tech items than to novelty giveaways aimed at a consumer audience, so the item should be chosen with the specific event's attendees in mind.